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Guides

What a LiDAR actually measures

A LiDAR times light. See how one echo becomes a distance, how a sweep becomes a point cloud, and what the sensor cannot tell a robot.

Why the quadratic formula works

Derive the quadratic formula by completing the square, see what the discriminant tells you, and check it on a worked example you can verify by hand.

A 20-minute inbox routine that gets you to zero

A four-pass routine for clearing an inbox in about 20 minutes: delete, delegate, reply fast, schedule the rest. Includes a 60-email worked example.

Getting work done

A follow-up cadence that isn't annoying

Plan four follow-up emails over three weeks: how to space them, add something useful each time, and know when to stop.

Getting work done

A moving house checklist

A week by week moving checklist for the eight weeks before a move: address changes, utilities, packing plan and what to keep with you on the day.

Getting work done

A new hire onboarding checklist

A checklist for a new teammate's first two weeks: accounts ready, people to meet and first tasks, with a day by day example.

Getting work done

A newsletter workflow from draft to send

A repeatable newsletter routine: outline, draft, edit, test send, schedule. Includes a monthly checklist you can copy and the mistakes it prevents.

Getting work done

A research brief template you can reuse

A six-section research brief you can copy for any project: question, context, method, findings, open questions and sources, with a filled-in example.

Getting work done

What a LiDAR actually measures

A LiDAR times light. See how one echo becomes a distance, how a sweep becomes a point cloud, and what the sensor cannot tell a robot.

Nov 12, 2026DuckyHelper

Why the quadratic formula works

Derive the quadratic formula by completing the square, see what the discriminant tells you, and check it on a worked example you can verify by hand.

Nov 12, 2026DuckyHelper

A 20-minute inbox routine that gets you to zero

A four-pass routine for clearing an inbox in about 20 minutes: delete, delegate, reply fast, schedule the rest. Includes a 60-email worked example.

Nov 12, 2026DuckyHelper

Getting work done

A follow-up cadence that isn't annoying

Plan four follow-up emails over three weeks: how to space them, add something useful each time, and know when to stop.

Nov 12, 2026DuckyHelper

Getting work done

A moving house checklist

A week by week moving checklist for the eight weeks before a move: address changes, utilities, packing plan and what to keep with you on the day.

Nov 12, 2026DuckyHelper

Getting work done

A new hire onboarding checklist

A checklist for a new teammate's first two weeks: accounts ready, people to meet and first tasks, with a day by day example.

Nov 12, 2026DuckyHelper

Getting work done

A newsletter workflow from draft to send

A repeatable newsletter routine: outline, draft, edit, test send, schedule. Includes a monthly checklist you can copy and the mistakes it prevents.

Nov 12, 2026DuckyHelper

Getting work done

A research brief template you can reuse

A six-section research brief you can copy for any project: question, context, method, findings, open questions and sources, with a filled-in example.

Nov 12, 2026DuckyHelper

Getting work done

A robotics learning path for high school students

A one-year plan from your first circuit to a robot that drives a course on its own, with four stages and a project to finish each one.

Nov 12, 2026DuckyHelper

A safety checklist for motors and batteries

A pre-power checklist for a classroom robot: batteries, wiring, fuses, pinch points and an emergency stop, with a worked fuse calculation.

Nov 12, 2026DuckyHelper

A simple cash flow forecast for a small business

Build a 12-week cash forecast in a spreadsheet: opening balance, inflows, outflows and a weekly view that shows when money runs low.

Nov 12, 2026DuckyHelper

Getting work done

A six-week plan for the digital SAT math section

A six-week math plan that starts with a diagnostic, rotates topics weekly, keeps an error log, and puts full practice tests in weeks 3 and 6.

Nov 12, 2026DuckyHelper

Absolute and incremental position sensing

Compare an incremental encoder with a potentiometer on a robot joint: what each reports at power-up, their resolution, drift risks and homing.

Nov 12, 2026DuckyHelper

Academic honesty and AI: following your school's rules

How to read a course AI policy, tell allowed from not allowed, disclose your use, and ask when the rule is unclear.

Nov 12, 2026DuckyHelper

AI on your computer

Accessibility trees: how apps describe their own buttons

Apps publish a structured description of every control for screen readers. See how a simple form looks in that tree, and why assistants use it.

Nov 12, 2026DuckyHelper

AI on your computer

Ackermann steering: why cars turn the way they do

Why a car's inner front wheel turns more than the outer one. Work out Ackermann steering angles, the turning circle and why skid steering scrubs.

Nov 12, 2026DuckyHelper

ACT science: reading graphs and tables fast

A fast method for ACT science data passages: identify variables and units first, find the trend, then answer from the table before reading the words.

Nov 12, 2026DuckyHelper

ACT vs SAT: how to choose which test to take

How to choose between the ACT and the SAT by comparing your own timed practice results, pacing and comfort, instead of guessing from reputation.

Nov 12, 2026DuckyHelper

Active and passive voice

Learn who-does-what in active and passive sentences, rewrite a passive paragraph, and see where passive voice is the right choice.

Nov 12, 2026DuckyHelper

Active recall: turning a page of notes into questions

Turn one page of chemistry notes into 12 questions (define, explain, compare, apply) and learn to answer them from memory before checking.

Nov 12, 2026DuckyHelper

Add wheel encoders and measure distance

Add wheel encoders to a small robot, count ticks, convert them to meters and calibrate until it drives one meter and stops.

Nov 12, 2026DuckyHelper

An assistant that only looks when you ask

What it means for an assistant to look and listen only when you ask: a worked example with one key press, plus what clear start and stop signals look like.

Nov 12, 2026DuckyHelper

AI on your computer

Analyzing a historical photograph

Analyze a historical photograph by asking who took it and why, what is in and out of frame, and what context it needs, using a Library of Congress example.

Nov 12, 2026DuckyHelper

Analyzing campaign results in a spreadsheet

Compare email campaign results in a spreadsheet: turn counts into rates with formulas and know when numbers are too small to trust.

Nov 12, 2026DuckyHelper

Getting work done

Answering "explain" and "justify" questions

Use claim, evidence, reasoning: state the answer first, cite the data, then connect them with the science. Shown with a pondweed biology answer.

Nov 12, 2026DuckyHelper

Answering common objections by email

A four-step method for replying to a buyer's objection by email, with a full worked reply to 'it's too expensive' you can adapt.

Nov 12, 2026DuckyHelper

Getting work done

Answering vs doing: two kinds of AI help on your computer

Some AI only explains; some also acts in your apps. See the difference with a form, when each one fits, and what to check before you let it act.

Nov 12, 2026DuckyHelper

AI on your computer

AP Biology experimental design questions

How to name independent, dependent and controlled variables and a control group, then justify a prediction, using a plant growth experiment you can check.

Nov 12, 2026DuckyHelper

AP Chemistry equilibrium free-response questions

Set up an ICE table, write the K expression correctly and solve for equilibrium concentrations, then check units and significant figures.

Nov 12, 2026DuckyHelper

AP Physics 1 free-body diagrams that earn credit

Draw a free-body diagram that others can read: label every force with its source, show directions, keep components off the diagram. Shown on an incline.

Nov 12, 2026DuckyHelper

AP Statistics: interpreting a confidence interval correctly

Compute a confidence interval for a mean and write the interpretation sentence correctly, including what the confidence level does and does not mean.

Nov 12, 2026DuckyHelper

Arithmetic and geometric sequences

Find the nth term and the sum of arithmetic and geometric sequences, starting from the pairing trick that gives 1 + 2 + ... + 100 = 5050.

Nov 12, 2026DuckyHelper

Asking about a chart on screen

Read a bar chart in a report by checking the axes, units and baseline, and ask an assistant what the chart shows and what it leaves out.

Nov 12, 2026DuckyHelper

AI on your computer

Asking about what is on screen beats describing it

Describing a problem to a helper loses details. Showing the screen keeps them. See how "what does this warning mean?" changes with the picture.

Nov 12, 2026DuckyHelper

AI on your computer

Asking an assistant a good question about your screen

Turn a vague question into a specific one for a screen-aware assistant: say what you want, point to the part, and say what you already tried.

Nov 12, 2026DuckyHelper

AI on your computer

Asking an assistant to show its arithmetic

Why you should ask an assistant to show its arithmetic, shown by checking a discount-and-tax percentage problem line by line to spot an error.

Nov 12, 2026DuckyHelper

AI on your computer

Assistants and multiple monitors

How a screen-aware assistant handles two displays: shared coordinates, mixed scaling, and why it should ask which screen you mean.

Nov 12, 2026DuckyHelper

AI on your computer

Back-of-the-envelope market sizing

How to size a market in ten minutes with labeled assumptions, using two methods and a worked bike shop example you can copy into a spreadsheet.

Nov 12, 2026DuckyHelper

Getting work done

Balancing chemical equations by counting atoms

Balance C₃H₈ + O₂ → CO₂ + H₂O step by step by counting atoms, change only coefficients, and check every element and the total mass.

Nov 12, 2026DuckyHelper

Batteries for robots: voltage, capacity and safety

Read battery numbers for robots: volts, amp hours, C ratings and runtime, plus the charging and storage rules that keep LiPo packs safe.

Nov 12, 2026DuckyHelper

Big O notation with everyday examples

Big O describes how an algorithm's work grows with input size. Compare constant, logarithmic, linear and quadratic growth with real tables.

Nov 12, 2026DuckyHelper

Computer science

Binary numbers and why computers use them

Learn place values in binary, convert 13 to 1101 and back, and see why computers store everything as bits and bytes.

Nov 12, 2026DuckyHelper

Computer science

Binary search step by step

Find a number from 1 to 100 in at most 7 guesses by halving, trace binary search in Python, and see why 2⁷ = 128 is enough.

Nov 12, 2026DuckyHelper

Computer science

Boolean logic and truth tables

Use AND, OR and NOT to build a door alarm, write its truth table row by row, and check it with De Morgan's laws.

Nov 12, 2026DuckyHelper

Computer science

Breaking a big job into steps an agent can do

How to split a large job into small, checkable steps with checkpoints so an agent can do it well, shown on a monthly report split into five steps.

Nov 12, 2026DuckyHelper

AI on your computer

Browser automation vs screen automation

Two ways software can do a task for you: through a page's structure or by looking at pixels. A side-by-side example and when each fits best.

Nov 12, 2026DuckyHelper

AI on your computer

Brushless motors and why drones use them

How a brushless motor and its ESC work, what KV means, and why drones use brushless motors, with a worked example and prop safety.

Nov 12, 2026DuckyHelper

Budgeting for a team

Build a quarterly team budget with categories, named owners and a simple way to track actual spending against the plan, using a spreadsheet.

Nov 12, 2026DuckyHelper

Getting work done

Build a gripper that knows when it is holding something

Make a servo gripper close in small steps, read a force sensor, and stop at a threshold so it holds an object without crushing it.

Nov 12, 2026DuckyHelper

Build a light-seeking robot with two light sensors

Wire two light sensors to two motors so a robot turns toward a lamp. See why crossed wiring seeks light and uncrossed wiring flees it.

Nov 12, 2026DuckyHelper

Build a line-following robot

Build a two-sensor line follower: the parts, the wiring, a four-case logic table, working code and a calm way to tune its speed.

Nov 12, 2026DuckyHelper

Build a self-balancing robot

Build a two-wheel robot that stands upright. Mount an IMU, blend gyro and accelerometer with a complementary filter, and tune a PID loop safely.

Nov 12, 2026DuckyHelper

Build an obstacle-avoiding car with an ultrasonic sensor

Build a small car that measures distance with sound, stops, backs up and turns when something is closer than 20 cm. Wiring, code and testing.

Nov 12, 2026DuckyHelper

Building a daily language habit in 15 minutes

Build a 15-minute daily language routine with review, input and output, tied to the same time each day, with streaks tracked loosely.

Nov 12, 2026DuckyHelper

Building a lead list in a spreadsheet

Build a clean lead list in a spreadsheet: pick sources, set consistent columns, remove duplicates with a formula, and keep it up to date.

Nov 12, 2026DuckyHelper

Getting work done

Building a simple monthly budget in a spreadsheet

Build a monthly budget sheet with income, fixed costs and spending categories, SUM by category, planned versus actual columns and one tab per month.

Nov 12, 2026DuckyHelper

Getting work done

Building a weekly study schedule around school and practice

Plan a study week with fixed blocks first, a short daily review and one buffer slot. Shown on a week with practice three evenings.

Nov 12, 2026DuckyHelper

Building an FAQ from real tickets

Turn a month of support tickets into a short FAQ: tag each ticket, group by question, write each answer once and link to it.

Nov 12, 2026DuckyHelper

Getting work done

Buoyancy: why ships float

Archimedes' principle explained with a floating wooden block: find how deep it sits, and see why a steel ship floats even though steel sinks.

Nov 12, 2026DuckyHelper

Camera calibration: fixing lens distortion

Calibrate a camera with a checkerboard to find its intrinsics and lens distortion, and see why straight lines look curved near the edge of an image.

Nov 12, 2026DuckyHelper

Canned replies that still sound human

How to write saved support replies that read like a person: a personal first line and plain words. Three before and after examples.

Nov 12, 2026DuckyHelper

Getting work done

Categorizing business expenses

Sort a month of transactions into a short category list with simple rules, a lookup formula and a review pile, so your totals mean something.

Nov 12, 2026DuckyHelper

Getting work done

Cellular respiration and ATP

Follow one glucose molecule through glycolysis, the Krebs cycle and the electron transport chain, and see how cells make ATP with or without oxygen.

Nov 12, 2026DuckyHelper

Center of mass and why robots tip over

Learn why robots tip over using center of mass and the support polygon, with a worked example of a tall load and how lowering it helps.

Nov 12, 2026DuckyHelper

Charts that tell the truth

Make an honest bar chart: start the axis at zero, label directly, and give each chart one message, with a worked before and after example.

Nov 12, 2026DuckyHelper

Getting work done

Checking an AI's answer before you rely on it

Four habits for checking an AI explanation: ask for steps, recompute numbers, test the result, and consult a source. Worked on a chemistry problem.

Nov 12, 2026DuckyHelper

AI on your computer

Checking facts before you share them

Check a statistic before you share it: trace the source, check the date and the context, with a worked example on a viral library visits claim.

Nov 12, 2026DuckyHelper

Getting work done

Checking where an AI got its information

Ask an assistant for its source, open it, and check the date. A step-by-step check using a made-up return policy question shows how to do it.

Nov 12, 2026DuckyHelper

AI on your computer

Choosing a robot simulator as a beginner

Compare Gazebo and Webots for a two-wheel robot on features, learning curve and community, and learn how to pick a robot simulator that fits you.

Nov 12, 2026DuckyHelper

Choosing sensors for a first robot

Pick sensors for an obstacle-avoiding robot by working out what it needs to know, the range required and the cost of added complexity.

Nov 12, 2026DuckyHelper

Choosing your first robot kit

Compare three kinds of beginner robot kit with a weighted scorecard so you pick the one that fits what you want to learn, without chasing prices.

Nov 12, 2026DuckyHelper

Circular motion and centripetal force

Why turning needs a force toward the center, how v²/r sets it, and how to find the fastest safe speed for a car on a curve.

Nov 12, 2026DuckyHelper

Citing sources in MLA and APA

See one book cited in both MLA and APA, learn what each style keeps and why, and know where to confirm the current rules.

Nov 12, 2026DuckyHelper

Classes and objects in plain words

Understand classes, objects, attributes and methods by building a Dog class with a bark method in Python and tracing two instances.

Nov 12, 2026DuckyHelper

Computer science

Cleaning up a messy CRM

Merge duplicate contacts in a customer database safely: pick match rules, choose the record to keep, fill required fields and assign an owner.

Nov 12, 2026DuckyHelper

Getting work done

Cleaning up form responses

Standardize, categorize and de-duplicate free-text form answers in a spreadsheet with TRIM, PROPER, a lookup table and COUNTIF, keeping the originals.

Nov 12, 2026DuckyHelper

Getting work done

Click by click vs one call: why site actions are faster

Why one saved action can beat many clicks: fewer steps, fewer places to fail and less work per run. Shown with a 40-click task as an illustration.

Nov 12, 2026DuckyHelper

AI on your computer

Collaborative robots and working safely near people

How collaborative robots share space with people: speed and separation monitoring, force limits and risk assessment, with a worked separation distance.

Nov 12, 2026DuckyHelper

Color and contrast: what assistants can miss

Charts that rely on color alone can be hard for people and assistants to read. Learn contrast ratios, color blindness and why labels fix the problem.

Nov 12, 2026DuckyHelper

AI on your computer

Color tracking to follow a ball

Follow an orange ball by color: why HSV beats RGB, how to pick thresholds, build a mask, find its centroid and steer toward it, with numbers.

Nov 12, 2026DuckyHelper

Commas: the rules that cover most cases

Four comma rules that cover most cases: lists, introductory clauses, joining sentences and nonessential clauses, with five errors fixed.

Nov 12, 2026DuckyHelper

Comparing prices before a purchase

Compare vendors by total cost, not sticker price: shipping, tax and returns in a comparison table, with a worked example on three office chairs.

Nov 12, 2026DuckyHelper

Getting work done

Comparing two accounts of the same event

Compare two accounts of the Boston Massacre by point of view and purpose, and learn how corroboration builds a reliable picture.

Nov 12, 2026DuckyHelper

Comparing two things side by side on your screen

Compare two phone plans open in two browser tabs: pick the columns, point at differences, check the sums and make the call yourself.

Nov 12, 2026DuckyHelper

AI on your computer

Competitive research in a spreadsheet

Compare competitors' public pricing pages in one spreadsheet with consistent columns, dates checked and sources linked, plus a yearly cost formula.

Nov 12, 2026DuckyHelper

Getting work done

Completing the square without memorizing steps

See completing the square as filling in a missing corner of a real square, solve x² + 8x + 3 = 0, and read off the vertex.

Nov 12, 2026DuckyHelper

Complex numbers as rotations

See multiplying by i as a 90 degree turn on the complex plane, use i² = −1, and find modulus and argument of 3 + i and 1 + i.

Nov 12, 2026DuckyHelper

Compound interest step by step

Grow $1,000 at 5 percent a year for 3 years by hand, compare with simple interest, and see where A = P(1 + r)^n comes from.

Nov 12, 2026DuckyHelper

Concept maps: drawing how ideas connect

Draw a concept map of the water cycle with nodes, linking phrases and cross links, building it from memory first.

Nov 12, 2026DuckyHelper

Conditional formatting that highlights what matters

Use conditional formatting rules and a custom formula to highlight overdue tasks by date, with a short color palette that keeps the sheet readable.

Nov 12, 2026DuckyHelper

Getting work done

Conditional probability with a screening test

Work through a made-up screening test on 1,000 people to see why a positive result on a rare condition is often a false alarm.

Nov 12, 2026DuckyHelper

Conservation of energy on a roller coaster

Use energy conservation to find a coaster's speed at the bottom of a 20 m drop, see why mass cancels, and learn what real friction changes.

Nov 12, 2026DuckyHelper

Context: how much an AI can keep in mind at once

What a context window is in plain words, why long conversations drift, and how summarising and starting fresh keep an assistant on track.

Nov 12, 2026DuckyHelper

AI on your computer

Coordinate frames and transforms

Learn how robots convert a point between frames with a rotation and a translation, using a camera that sees a cup and a chain of transforms.

Nov 12, 2026DuckyHelper

Copying data from PDFs into a spreadsheet

Get a table out of a PDF and into a spreadsheet with clean columns, real numbers and a total you have checked against the original.

Nov 12, 2026DuckyHelper

Getting work done

Correcting an assistant when it gets something wrong

Assistants misread numbers and mix up details. Learn to correct one clearly so the next answer is right, using a misread invoice total as the example.

Nov 12, 2026DuckyHelper

AI on your computer

Correlation is not causation

Use ice cream sales and sunburns to see confounding variables, reverse causation and what a randomized experiment adds, with r computed by hand.

Nov 12, 2026DuckyHelper

Data safety basics for AI tools at work

A practical checklist for using AI tools at work: what not to paste or show, why company rules come first, and how least access limits harm.

Nov 12, 2026DuckyHelper

AI on your computer

Date math in spreadsheets

Calculate days and working days between two dates, understand dates as numbers, and use NETWORKDAYS with a holiday list in Excel or Google Sheets.

Nov 12, 2026DuckyHelper

Getting work done

Debugging a program methodically

Debug by reproducing, isolating, inspecting and fixing, then testing. A worked off-by-one error in a Python loop shows each step.

Nov 12, 2026DuckyHelper

Computer science

Deciding whether to retake the SAT

Compare two score reports: look at section scores, time until deadlines and what you would change. A framework that avoids guesswork, with an example.

Nov 12, 2026DuckyHelper

Degrees of freedom: why your arm has seven

Count degrees of freedom in a human arm and a rigid body, see why reaching a pose needs six, and learn what a seventh joint adds.

Nov 12, 2026DuckyHelper

Describing a picture on your screen

How an assistant describes an image, what it can really see versus what it can only guess, and how to treat its uncertainty.

Nov 12, 2026DuckyHelper

AI on your computer

Designing a controlled experiment

Plan a fair test: pick one independent variable, hold the others constant, use a control group and repeats, shown with bean plants and light.

Nov 12, 2026DuckyHelper

Designing a survey people finish

Design a ten-question customer survey that people finish: keep it short, ask one idea per question, show progress and test it on a real person.

Nov 12, 2026DuckyHelper

Getting work done

Differential drive: steering with two wheels

Compute forward speed, turn rate and turning radius of a two-wheeled robot from its wheel speeds, and see where the model breaks down.

Nov 12, 2026DuckyHelper

Dijkstra and A*: what the heuristic buys you

Compare Dijkstra and A* on the same grid map, count the cells each expands, and see what an admissible heuristic buys and when it does not.

Nov 12, 2026DuckyHelper

Dragging files in for help

What happens when you drop a PDF or document onto an assistant: file types, how pages get read, scanned versus typed, and privacy.

Nov 12, 2026DuckyHelper

AI on your computer

Drawing free-body diagrams step by step

A step-by-step method for free-body diagrams: list forces, choose axes, split into components, and solve a box sliding down a ramp with friction.

Nov 12, 2026DuckyHelper

Drawing Lewis structures step by step

A repeatable method for Lewis structures: count valence electrons, pick the central atom, complete octets, and form double bonds. Worked on CO₂.

Nov 12, 2026DuckyHelper

Drone flight controllers and stabilization

How a drone flight controller holds level in a gust: IMU readings, nested angle and rate PID loops per axis, a motor mixer and flight modes.

Nov 12, 2026DuckyHelper

Dropdown lists with data validation

Add a dropdown to a spreadsheet column with data validation, choose a list source, write a clear error message and keep your data consistent.

Nov 12, 2026DuckyHelper

Getting work done

Dual coding: pairing words with pictures

Pair words with your own simple sketches and explain them aloud. Shown by sketching and labeling the stages of mitosis.

Nov 12, 2026DuckyHelper

Echo cancellation: why an assistant doesn't hear itself

How echo cancellation lets a voice assistant speak from your speakers without hearing itself, with delay numbers and why headphones still help.

Nov 12, 2026DuckyHelper

AI on your computer

Elaboration: asking why and how until it clicks

Ask a chain of why and how questions, connect each answer to what you already know, then check a source. Shown with why ice floats on water.

Nov 12, 2026DuckyHelper

Electric and magnetic fields in plain words

What a field is, how field lines and the right-hand rule work, and a worked example of a compass needle turning near a wire carrying current.

Nov 12, 2026DuckyHelper

Electron configurations and the periodic table

Write electron configurations by following the filling order, such as oxygen's 1s² 2s² 2p⁴, and read them straight off the periodic table.

Nov 12, 2026DuckyHelper

Email templates for requests you send every week

Build reusable email templates with placeholders for status, scheduling and invoice requests, and learn when a template is the wrong tool.

Nov 12, 2026DuckyHelper

Getting work done

Emergency stops and safe robot design

How an emergency stop works: a normally closed circuit that cuts motor power, stop categories in plain words, hardware versus software stops and testing.

Nov 12, 2026DuckyHelper

Endothermic and exothermic reactions

Why cold packs get cold and hand warmers get warm: energy diagrams, bonds breaking and forming, the sign of ΔH, and a calorimetry calculation.

Nov 12, 2026DuckyHelper

Enzymes and why temperature and pH matter

Understand the enzyme active site, why heat and wrong pH denature enzymes, and how to read an activity curve to find the optimum.

Nov 12, 2026DuckyHelper

Escalation rules for a small support team

How a small support team decides when to hand a ticket to engineering: severity levels, clear triggers and what to include, with a worked example.

Nov 12, 2026DuckyHelper

Getting work done

Euler angles vs quaternions

See why three Euler angles can lose a degree of freedom at gimbal lock, and how a four-number quaternion represents the same 3D rotation safely.

Nov 12, 2026DuckyHelper

Exoskeletons: robots you wear

How a wearable exoskeleton helps with a lift: torque and power at the hip, assistive versus augmentative designs, sensing intent and safety limits.

Nov 12, 2026DuckyHelper

Explaining why events happened: cause and consequence

Explain why World War I began by separating long-term from short-term causes, ranking them and backing each with evidence.

Nov 12, 2026DuckyHelper

Exponent rules and why they follow from counting factors

Derive the product, quotient, power, zero and negative exponent rules by counting factors, starting from 2³ × 2⁴ = 2⁷.

Nov 12, 2026DuckyHelper

Exponential growth vs linear growth

Compare adding 10 each day with doubling each day over 10 days, see when doubling overtakes, and learn to tell the two from a table.

Nov 12, 2026DuckyHelper

Factoring quadratics when a is not 1

Factor 6x² + 11x − 10 with the ac method, check by expanding, and learn when to stop factoring and use the quadratic formula.

Nov 12, 2026DuckyHelper

Feedback vs open-loop control

Compare open-loop and feedback control with a toaster timer and a thermostat, and learn when a robot can safely skip the sensor.

Nov 12, 2026DuckyHelper

Fiducial markers for robot positioning

How a camera finds a printed square marker's position and orientation, from its known size and pattern, with distance and offset worked out.

Nov 12, 2026DuckyHelper

Filling out online forms without mistakes

How to complete a long online form accurately: gather documents first, save progress, review before you submit, and never share one-time codes.

Nov 12, 2026DuckyHelper

Getting work done

Finals week: a plan for the last ten days

Plan the last ten days before finals: order subjects by exam date and difficulty, mix daily review, and treat sleep and meals as part of the plan.

Nov 12, 2026DuckyHelper

Finding a meeting time across time zones

Find a meeting slot for people in New York, London and Singapore by converting working hours to UTC and looking for overlap, then set the invite correctly.

Nov 12, 2026DuckyHelper

Getting work done

Finding a setting inside an app

How a screen-aware assistant helps you find a setting like dark mode by showing you where to click, and why that beats menus and search.

Nov 12, 2026DuckyHelper

AI on your computer

Finding and cancelling subscriptions you forgot

Find forgotten recurring charges by reading bank statements, list them in a sheet, work out the yearly cost, cancel safely and set reminders.

Nov 12, 2026DuckyHelper

Getting work done

Finding customers who appear in two lists

Match emails between two exports: clean the lists first, then use COUNTIF or XLOOKUP to mark which customers appear in both.

Nov 12, 2026DuckyHelper

Getting work done

Finding objects in a camera image

How a robot finds an object in a camera image: pixels, thresholds, contours and size, with a red ball located and its distance estimated.

Nov 12, 2026DuckyHelper

Finding reliable sources online

Find and check reliable sources online: go to primary sources, check dates, cross-check, with a worked example on a product recall claim.

Nov 12, 2026DuckyHelper

Getting work done

Finding the story for a personal essay

Find a personal essay story by brainstorming from three small moments, then use specific scenes and honest reflection to give it meaning.

Nov 12, 2026DuckyHelper

Fixing a robot that won't drive straight

Find out why your robot veers: measure the drift, check the mechanics, compare wheel speeds, then add a simple encoder feedback correction.

Nov 12, 2026DuckyHelper

Fixing speech recognition mistakes quickly

Why speech recognition mishears words and a fast three step fix: repeat, rephrase, spell. Plus how to help it in a quiet room.

Nov 12, 2026DuckyHelper

AI on your computer

Follow-up questions: how an assistant keeps track of the conversation

Why you can ask "and why?" and get a sensible answer. See how an assistant carries context from turn to turn, and where that memory runs out.

Nov 12, 2026DuckyHelper

AI on your computer

Following an assistant's spoken answer with captions

Why captions help when an AI assistant talks, how reading along works step by step, and what to do in noisy places or when speech is too fast.

Nov 12, 2026DuckyHelper

AI on your computer

Following up on unpaid invoices

A calm, step-by-step routine for chasing late invoices: when to write, what to include, how the tone changes, and a full friendly reminder you can adapt.

Nov 12, 2026DuckyHelper

Getting work done

Food webs and energy in ecosystems

Read a grassland food web, name producers, consumers and decomposers, and see why less energy reaches each higher level.

Nov 12, 2026DuckyHelper

Force and torque sensors: how robots feel a push

See how strain gauges let a robot sense force, calibrate a reading to newtons, and use a threshold so a gripper stops when it touches an object.

Nov 12, 2026DuckyHelper

Forward kinematics of a two-joint arm

Compute where a two-joint robot arm's hand ends up from its joint angles, using trigonometry, one worked example and a sketch check.

Nov 12, 2026DuckyHelper

From DNA to protein

Follow a short gene from DNA to mRNA to protein: transcription, codons, translation and how to read the genetic code table.

Nov 12, 2026DuckyHelper

From form to spreadsheet: collecting responses automatically

Link a Google Form to a spreadsheet so every answer lands in a row, then clean it, summarize it with formulas and share the results safely.

Nov 12, 2026DuckyHelper

Getting work done

From your question to its voice: what happens in between

Follow one spoken question to a spoken answer through speech to text, the screen, the reply, text to speech and streaming, plus limits.

Nov 12, 2026DuckyHelper

AI on your computer

Gear ratios: trading speed for torque

How gear ratios multiply torque and divide speed, with a 10:1 gearbox worked through, including efficiency losses and gear safety.

Nov 12, 2026DuckyHelper

Getting a family schedule into one calendar

Bring school, sports and appointments into one shared calendar with colors and reminders, using a worked example of a busy week.

Nov 12, 2026DuckyHelper

Getting work done

Getting a spreadsheet formula explained on screen

Break an INDEX and MATCH formula into parts, test each piece, and get it explained on screen so you can reuse the pattern with confidence.

Nov 12, 2026DuckyHelper

AI on your computer

Getting a voice assistant to understand you in a noisy room

Why background noise hurts voice assistants and how microphone position, short questions and small habits fix it, with a library example.

Nov 12, 2026DuckyHelper

AI on your computer

Getting feedback on your writing without having it written for you

Ask an assistant for comments instead of rewrites, so you improve your own paragraph and keep your own voice. Includes a worked example.

Nov 12, 2026DuckyHelper

AI on your computer

Getting quizzed on what is on your screen

How an assistant that can see your notes turns them into a short quiz, why testing yourself beats rereading, and where to check its questions.

Nov 12, 2026DuckyHelper

AI on your computer

Getting started with FIRST and VEX competitions

How robotics competitions work, how to join or start a team, and what to do in the first month, without needing to know the current rules by heart.

Nov 12, 2026DuckyHelper

Grammatical gender without the headache

Learn nouns with their article, see how gender differs across Spanish, French and German, and use patterns and colors to keep it straight.

Nov 12, 2026DuckyHelper

Graphing a line from its equation

Graph y = −2x + 4 from its intercept and slope, check with a test point, and find parallel and perpendicular lines.

Nov 12, 2026DuckyHelper

Graphs and shortest paths

Model a map as a graph of nodes and weighted edges, then trace Dijkstra's algorithm on a five-town map to find the shortest route.

Nov 12, 2026DuckyHelper

Computer science

Grippers: how robots pick things up

Compare parallel-jaw and suction grippers on a 1 kg box using friction and pressure, with grip force numbers and the role of compliance.

Nov 12, 2026DuckyHelper

Half-life and radioactive decay

Half-life is the time for half of a radioactive sample to decay. Work out 80 g after three half-lives, then see how carbon dating uses the idea.

Nov 12, 2026DuckyHelper

Handing a window to an assistant to finish a job

What it means to hand a window to an AI assistant: dragging a task onto a sheet, what it asks first, and where you stay in control.

Nov 12, 2026DuckyHelper

AI on your computer

Handing off an email conversation to a colleague

How to pass an email conversation to a colleague so they can act at once: a context summary, who does what next, and a worked introduction example.

Nov 12, 2026DuckyHelper

Getting work done

Handling refund requests consistently

How to handle refund requests the same way every time: a written policy, a short list of exceptions and a log, with a worked example outside the window.

Nov 12, 2026DuckyHelper

Getting work done

Hash tables and why lookups are fast

See how a hash function turns a name into a bucket number, handles a collision in a contacts app, and why lookups stay fast.

Nov 12, 2026DuckyHelper

Computer science

Heat vs temperature

Heat and temperature are different things. Use Q = mcΔT to find the energy to warm 1 kg of water by 10 °C, and see why coasts stay mild.

Nov 12, 2026DuckyHelper

Helping older adults learn computers with an assistant

How to help a grandparent learn video calls with an AI assistant: patience, showing on screen, and simple steps that build confidence.

Nov 12, 2026DuckyHelper

AI on your computer

Hints before answers: getting unstuck without being handed the solution

Use graduated hints to get unstuck without being handed the answer, shown on a geometry proof with three hints and a guide to when to ask outright.

Nov 12, 2026DuckyHelper

AI on your computer

Hold to talk vs wake words

Two ways to start a voice assistant: press a key, or say a magic phrase. How each works, what each costs in privacy, and when each fits.

Nov 12, 2026DuckyHelper

AI on your computer

Homeostasis and feedback loops

See how negative feedback keeps body temperature steady, with sensors, a control centre and effectors, and where positive feedback fits.

Nov 12, 2026DuckyHelper

House rules for kids using AI helpers

A family agreement for AI homework help: hints first, time limits, talking about what the helper said, and parents who decide the rules.

Nov 12, 2026DuckyHelper

AI on your computer

How a computer runs your code

Follow the fetch, decode, execute cycle on a toy processor, and learn how CPU, memory and storage differ, and what compiled vs interpreted means.

Nov 12, 2026DuckyHelper

Computer science

How a magnifying glass works

See how a convex lens bends light, use the thin lens equation on a 10 cm focal length, and tell real images from virtual ones.

Nov 12, 2026DuckyHelper

How a quadcopter flies

How four propellers control a quadcopter: thrust for lift, opposite spin directions to cancel torque, and thrust differences for roll, pitch and yaw.

Nov 12, 2026DuckyHelper

How a quadruped robot keeps its balance

How a four-legged robot stays upright: the support polygon, shifting the center of mass, foot placement and IMU feedback, with numbers.

Nov 12, 2026DuckyHelper

How a web page gets to your screen

Follow what happens when you type an address and press enter: DNS, the request and response, and how HTML, CSS and JavaScript build the page.

Nov 12, 2026DuckyHelper

Computer science

How AI reads images and text together

What it means for an AI to read an image and text together, shown on a slide with a diagram and caption, and where this kind of reading goes wrong.

Nov 12, 2026DuckyHelper

AI on your computer

How an AI agent works in a window with its own cursor

An agent can work in one window with its own cursor while you keep using yours. See how that works, with an agent filling a sheet as you write.

Nov 12, 2026DuckyHelper

AI on your computer

How an AI explains a diagram it can see

See how an assistant reads a labeled diagram, names its parts and explains how they connect, using the heart as one worked example.

Nov 12, 2026DuckyHelper

AI on your computer

How an AI finds the right button on a screen

How an assistant picks "Save" out of a crowded toolbar: labels, icons, position, and what it does when two buttons look alike.

Nov 12, 2026DuckyHelper

AI on your computer

How an AI tutor decides how much to explain

How a good AI tutor decides how much to say: ask what you know, give one step at a time, and check your understanding before moving on.

Nov 12, 2026DuckyHelper

AI on your computer

How an assistant knows which window you mean

When you say "this" with two windows open, how does an assistant choose? Focus, recency, and asking you to clarify.

Nov 12, 2026DuckyHelper

AI on your computer

How an assistant reads code on your screen

What happens when an assistant looks at code in your editor: reading the text, explaining lines, pointing at the bug, and where it can go wrong.

Nov 12, 2026DuckyHelper

AI on your computer

How an assistant that sees your screen works

What happens between "what does this error mean?" and a spoken answer: capture, reading, understanding, and the limits of each step.

Nov 12, 2026DuckyHelper

AI on your computer

How an assistant turns a request into a plan

See how an AI assistant breaks a request like finding the cheapest train into a goal, steps and checks, and where a good one stops to ask you.

Nov 12, 2026DuckyHelper

AI on your computer

How an IMU knows which way is down

Learn how an IMU finds tilt: an accelerometer at rest reads gravity, a gyroscope reads rotation rate, and motion fools the first one.

Nov 12, 2026DuckyHelper

How AP Calculus free-response answers earn points

How to write an AP Calculus free-response answer that earns credit: a related rates example with setup, units, derivative and a justified final answer.

Nov 12, 2026DuckyHelper

How assistants fill in forms carefully

How a careful assistant fills a registration form: read the labels, match the formats, and stop for your review before anything is submitted.

Nov 12, 2026DuckyHelper

AI on your computer

How assistants handle sign-in pages safely

What a well-behaved assistant does when a task hits a login wall: stop, hand control back to you, wait, and resume after you sign in.

Nov 12, 2026DuckyHelper

AI on your computer

How assistants read handwriting in a photo

How an assistant reads handwritten math in a photo, why unclear characters cause mistakes, and how to confirm what it read before it solves.

Nov 12, 2026DuckyHelper

AI on your computer

How assistants read math on a screen

Why fractions and exponents are hard for an AI to read from a PDF, a worked example where x^2/3 is misread, and how to confirm what it saw.

Nov 12, 2026DuckyHelper

AI on your computer

How assistants read tables and spreadsheets on screen

How an assistant makes sense of rows, columns, headers, merged cells and hidden data in a table, with a worked sheet example.

Nov 12, 2026DuckyHelper

AI on your computer

How assistants search the web for you

See how an assistant turns "is the store open on Sunday?" into search, open, read and cite, and why you should still check the date on the page.

Nov 12, 2026DuckyHelper

AI on your computer

How DC motors turn electricity into motion

See how magnets and coils turn current into torque, then compute the speed, torque and stall current of a small hobby motor.

Nov 12, 2026DuckyHelper

How depth cameras see in 3D

Understand how a depth camera measures distance, using stereo disparity Z = fB/d in a worked example, and when sunlight or distance breaks it.

Nov 12, 2026DuckyHelper

How encryption keeps messages private

Encrypt HELLO with a Caesar cipher, see why it breaks, then learn the idea of public and private keys with a toy example.

Nov 12, 2026DuckyHelper

Computer science

How GPS works and why robots need more than GPS

See how GPS finds a position from satellite distances, why a fourth satellite is needed, and why robots add other sensors indoors and in cities.

Nov 12, 2026DuckyHelper

How Mars rovers drive with a signal delay

Work out the light travel time between Earth and Mars, see why a rover cannot be joysticked, and how planned drives and onboard autonomy fill the gap.

Nov 12, 2026DuckyHelper

How mobile robots navigate a warehouse floor

Follow a warehouse robot between shelves: a grid map, floor markers, one-way traffic rules and safety zones sized from its real stopping distance.

Nov 12, 2026DuckyHelper

How natural selection works

See natural selection as four steps, with a peppered moth example and a worked table of how a trait spreads, plus what selection does not do.

Nov 12, 2026DuckyHelper

How neurons send signals

Follow an action potential along an axon: resting potential, sodium and potassium channels, and how a synapse passes the message on.

Nov 12, 2026DuckyHelper

How on-screen drawing points at things

How an assistant draws a circle on your actual screen: a transparent layer, screen coordinates, scaling for sharp displays and several monitors.

Nov 12, 2026DuckyHelper

AI on your computer

How photosynthesis turns light into sugar

Follow the equation 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ through the light reactions and the Calvin cycle, and see where the oxygen really comes from.

Nov 12, 2026DuckyHelper

How plants move water from roots to leaves

See how transpiration, xylem, cohesion and adhesion pull water up a plant, with a potometer calculation for a hot day.

Nov 12, 2026DuckyHelper

How robot vacuums plan their cleaning paths

Cover a room with a 2D grid map: back-and-forth coverage lanes, going around obstacles, and finding the way back to the dock before the battery runs out.

Nov 12, 2026DuckyHelper

How robotic hands sense touch

See how a fingertip pressure sensor turns force into a voltage, how tactile arrays and slip detection work, and why artificial touch is hard.

Nov 12, 2026DuckyHelper

How robots grasp objects they have never seen

Follow a robot picking a new object from a table: propose grasp candidates, score them with friction cones, then use feedback after contact.

Nov 12, 2026DuckyHelper

How ROS connects robot software

See how ROS splits a robot's software into nodes that talk over topics with typed messages, using a camera node and a detector node as the example.

Nov 12, 2026DuckyHelper

How screen-aware assistants can help with accessibility

How a screen-aware assistant can read small text aloud and explain what is on screen, where it helps, and why it does not replace assistive technology.

Nov 12, 2026DuckyHelper

AI on your computer

How self-driving cars combine their sensors

Why a car pairs cameras, radar and LiDAR, how sensor fusion weighs their noisy range estimates, and why redundancy matters for a pedestrian.

Nov 12, 2026DuckyHelper

How speech recognition turns your voice into text

From sound waves to words: how a spoken question becomes text, why context matters, and why noise and accents make it harder.

Nov 12, 2026DuckyHelper

AI on your computer

How text to speech gives an assistant a voice

How written words become spoken audio, why a reply can start talking before it is finished, and what makes a voice sound natural.

Nov 12, 2026DuckyHelper

AI on your computer

How the digital SAT's adaptive modules work

Learn how the digital SAT's second module depends on your first, and how to practice each module so an early mistake doesn't carry through.

Nov 12, 2026DuckyHelper

How the heart pumps blood

Trace blood through the four chambers and valves of the heart, and see how the pulmonary and systemic circuits fit together.

Nov 12, 2026DuckyHelper

How to annotate a novel for English class

Annotate while you read so the book answers essay questions later: symbols, short margin summaries and a chapter note, shown on Gatsby chapter 1.

Nov 12, 2026DuckyHelper

How to ask a good question in class or office hours

Turn "I don't get it" into a question a teacher can answer in two minutes: show what you tried and name the step where you got lost.

Nov 12, 2026DuckyHelper

How to break a big project into daily tasks

Break a big project into milestones from the deadline backward, then into next physical actions, with a buffer week. Shown on a science fair project.

Nov 12, 2026DuckyHelper

How to check your own work before handing it in

A three-pass check you can run in ten minutes: reread the question, test units and rough size, then check signs. Shown on a physics problem set.

Nov 12, 2026DuckyHelper

How to give an AI agent a task it can finish

How to turn a vague request into a clear task for an AI agent: state the goal, where to work, what done looks like, and the limits it must respect.

Nov 12, 2026DuckyHelper

AI on your computer

How to make a one-page summary sheet for any unit

Condense a unit on cells into key ideas, one diagram and five practice questions on a single page, then use the sheet to test yourself.

Nov 12, 2026DuckyHelper

How to plan a study session in timed rounds

Split a two-hour evening into four timed rounds with one task each, short breaks and round lengths that fit the work. Includes a full schedule.

Nov 12, 2026DuckyHelper

How to prepare for an open-book exam

Open-book still means knowing where things are. Tab your textbook, build a summary index, write formulas out and practise under time.

Nov 12, 2026DuckyHelper

How to read a primary source

Read a primary source by asking who wrote it, for whom, why and when, shown on the opening of the Declaration of Independence.

Nov 12, 2026DuckyHelper

How to read a textbook chapter in one sitting without losing it

A method for reading a 30-page history chapter in one sitting: preview, write questions first, then recall after each section.

Nov 12, 2026DuckyHelper

How to read a titration curve

Follow a strong acid titrated with a strong base: starting pH, the steep jump, the equivalence point at pH 7, and how weak acid curves differ.

Nov 12, 2026DuckyHelper

How to read an error message

Read a Python traceback from the bottom up: the error type, the message, the line number and the call path, using a NameError.

Nov 12, 2026DuckyHelper

Computer science

How to recover after a bad test grade

Sort every lost point into an error type, fix the most common type first, and ask for the marking scheme. Shown on a chemistry test scored 31 out of 50.

Nov 12, 2026DuckyHelper

How to stop rereading and start testing yourself

Rereading feels productive because the page looks familiar, but a test needs recall. Swap rereading for a 20-minute self-quiz, with a worked example.

Nov 12, 2026DuckyHelper

How to study math so it sticks

Redo a solved example from a blank page: cover the solution, fade the steps, and keep an error list so the method stays with you.

Nov 12, 2026DuckyHelper

How to take notes you will actually reread

Use the Cornell layout on a 50-minute biology lecture: a cue column, a notes column and a summary strip that make review easy and quick.

Nov 12, 2026DuckyHelper

How to tell when an AI assistant is listening

The visual signals that show whether a voice assistant is listening, thinking or idle, and why a pill you open with a key press makes the answer obvious.

Nov 12, 2026DuckyHelper

AI on your computer

How underwater robots navigate without GPS

Learn how a submersible measures depth with sonar, tracks position by dead reckoning, corrects drift with acoustic positioning, and maps a lake bottom.

Nov 12, 2026DuckyHelper

How vaccines train the immune system

See how a vaccine uses a harmless antigen to build memory cells, and why a second exposure gives a faster, stronger response.

Nov 12, 2026DuckyHelper

How waves carry energy

Learn how waves move energy without moving matter, use v = fλ on a 440 Hz sound, and see why amplitude and energy are linked.

Nov 12, 2026DuckyHelper

I2C, SPI and UART: how parts talk to each other

Compare I2C, SPI and UART by wires, speed and addressing, with an IMU on I2C and a GPS on UART worked out, and a way to choose between them.

Nov 12, 2026DuckyHelper

IF and nested IF without the confusion

Learn how IF works, how to nest it for letter grades, why the order of tests matters, and when IFS is a cleaner alternative.

Nov 12, 2026DuckyHelper

Getting work done

Imitation learning: robots that learn from demonstrations

Learn how a robot copies a pick-and-place from demonstrations you give by guiding its arm, why it can drift, and where this approach stops working.

Nov 12, 2026DuckyHelper

Importing a CSV without breaking dates and leading zeros

Open a CSV in a spreadsheet without losing ZIP code zeros or flipping day and month: use import settings, text columns and a clear date format.

Nov 12, 2026DuckyHelper

Getting work done

INDEX and MATCH for flexible lookups

Use INDEX and MATCH to look up a value to the left of the key, return a cell from a grid, and do two-way lookups that survive added columns.

Nov 12, 2026DuckyHelper

Getting work done

Inequalities and why the sign flips

Solve −2x > 6 to get x < −3, see why multiplying by a negative reverses the sign, check on a number line and write interval notation.

Nov 12, 2026DuckyHelper

Infrared reflectance sensors for line following

See how an infrared reflectance sensor tells black tape from a white floor, choose a threshold from real readings, and handle ambient light.

Nov 12, 2026DuckyHelper

Interleaving: why mixing problem types feels worse and works better

Practice area and volume problems mixed together instead of in blocks, and learn the skill the blocks hide: choosing the method.

Nov 12, 2026DuckyHelper

Intermolecular forces and boiling points

Why water boils at 100 °C and methane at −162 °C despite similar mass: dispersion forces, dipole attractions and hydrogen bonding explained.

Nov 12, 2026DuckyHelper

Interrupts and timing on a microcontroller

Why polling misses fast pulses, how an interrupt counts wheel encoder ticks, and the rules for writing short, safe interrupt handlers.

Nov 12, 2026DuckyHelper

Interview scorecards that help you decide

Build a scorecard of criteria, score each with evidence, and have interviewers score independently first, shown with a sales role example.

Nov 12, 2026DuckyHelper

Getting work done

Ionic and covalent bonds

Compare sodium chloride (electron transfer) and water (electron sharing), use electronegativity differences, and link bond type to properties.

Nov 12, 2026DuckyHelper

Isotopes and average atomic mass

Isotopes are atoms of one element with different neutron counts. Compute chlorine's average atomic mass of 35.45 from its two main isotopes.

Nov 12, 2026DuckyHelper

Keeping an error log that stops repeat mistakes

Log five algebra mistakes from one quiz, sort each by cause (concept, careless, misread), and review the log weekly so mistakes stop repeating.

Nov 12, 2026DuckyHelper

Lab safety rules and the reasons behind them

Why labs require goggles, no food, labels and acid-into-water dilution, with a worked dilution and what to do in an emergency.

Nov 12, 2026DuckyHelper

Le Chatelier's principle with examples

How a reaction at equilibrium responds to added reactant, pressure or heat. Worked with numbers using Q versus K, and why catalysts do not shift it.

Nov 12, 2026DuckyHelper

Learning a website once and reusing it

The first run on a site is slow while the assistant learns it. The second run reuses it. See what is saved and what happens if the site changes.

Nov 12, 2026DuckyHelper

AI on your computer

Learning from worked examples the right way

Study a solved problem actively: explain each step to yourself, cover and redo it, then try a similar problem. Shown with a stoichiometry example.

Nov 12, 2026DuckyHelper

Learning new software with an assistant beside you

How to learn an unfamiliar program with an assistant beside you: ask where things are, get shown on screen, and build the habit by doing.

Nov 12, 2026DuckyHelper

AI on your computer

Learning Spanish present tense verbs by pattern

Learn regular Spanish present tense verbs by pattern: the -ar, -er and -ir endings, shown with hablar, comer and vivir.

Nov 12, 2026DuckyHelper

Learning subject vocabulary with word roots

Split science words into Greek and Latin roots to learn them faster. Shown with 20 biology terms built from a dozen roots, plus a spaced review plan.

Nov 12, 2026DuckyHelper

Learning vocabulary from context sentences

Learn ten words from one short text using sentence cards and collocations, and space your reviews so the words stay.

Nov 12, 2026DuckyHelper

LiDAR SLAM vs visual SLAM

Map an office both ways: how LiDAR and camera-based SLAM work, what each is good at, how stereo depth is computed, and where each one fails.

Nov 12, 2026DuckyHelper

Limiting reagents

Find which reactant runs out first and how much product forms, using hydrogen and oxygen making water, plus a sandwich analogy.

Nov 12, 2026DuckyHelper

Limits: what happens near a point

Understand a limit as the value a function approaches, using (x² − 1)/(x − 1) as x approaches 1, tables of values, factoring and one-sided limits.

Nov 12, 2026DuckyHelper

Listening practice with podcasts and transcripts

Practise listening with one five-minute episode in three passes: gist, details, then reading along, and slow it down when needed.

Nov 12, 2026DuckyHelper

Lists, dictionaries and sets

Compare Python lists, dictionaries and sets by counting the words in a sentence, and learn when to use each one.

Nov 12, 2026DuckyHelper

Computer science

Literature review basics for work projects

Run a small literature review for a work project: search terms, a notes template and a synthesis grid, shown with five papers on remote onboarding.

Nov 12, 2026DuckyHelper

Getting work done

Localization: how a robot knows where it is

How a robot works out where it is on a known map by combining dead reckoning with landmark sightings, as uncertainty grows and then shrinks.

Nov 12, 2026DuckyHelper

Logarithms as questions about exponents

Read log₂ 32 as "2 to what power gives 32?", then derive the log rules from exponent rules and use change of base on a calculator.

Nov 12, 2026DuckyHelper

Logging calls in a CRM the same day

A same-day routine for logging a sales call: which fields matter, how to write the note, and a worked discovery-call example.

Nov 12, 2026DuckyHelper

Getting work done

Loop closure: how SLAM fixes drift

How loop closure lets a SLAM system fix accumulated drift when a robot returns to a known place, with a 40 m loop and a 0.8 m correction.

Nov 12, 2026DuckyHelper

macOS screen recording and accessibility permissions explained

What the Screen Recording, Accessibility and Microphone permissions on a Mac each allow, where to find them, and how to revoke them safely.

Nov 12, 2026DuckyHelper

AI on your computer

Make a Bluetooth remote-controlled robot

Drive a small robot from a phone over Bluetooth serial: one-letter commands, a motor driver, and a stop timeout for when the signal drops.

Nov 12, 2026DuckyHelper

Make a pan-tilt camera that tracks a colored ball

Use two servos and simple color tracking to keep a ball centered in the camera view, with proportional control and smoothing explained.

Nov 12, 2026DuckyHelper

Make a robot arm from four servos

Build a four-servo arm that moves a pen to three marked points. Covers servo power, angle limits, the two-link math and sequencing moves.

Nov 12, 2026DuckyHelper

Making a monthly expense report

Make a monthly expense report in a spreadsheet: list each item, assign a category, total with SUMIF, match every receipt and submit on time.

Nov 12, 2026DuckyHelper

Getting work done

Making a one-card cheat sheet when your teacher allows one

If your teacher allows a note card, fill it with what you forget under pressure, sorted by problem type, and write it yourself. A physics final example.

Nov 12, 2026DuckyHelper

Making a timeline that shows causes

Turn a list of dates into a timeline with arrows for cause, using the road to the American Revolution as a worked example.

Nov 12, 2026DuckyHelper

Map a room with a 2D LiDAR

Build an occupancy grid from a 2D LiDAR scan: turn each beam into a grid cell, mark free and occupied space, and see why drift blurs the map.

Nov 12, 2026DuckyHelper

Matrices: what multiplying them means

See a 2 by 2 matrix as a transformation: rotate a point by 90 degrees, multiply rows by columns, and learn why order matters.

Nov 12, 2026DuckyHelper

Mean, median and mode: which one to report

Compare mean, median and mode on house prices with one mansion, see how outliers and skew move them and choose the honest summary.

Nov 12, 2026DuckyHelper

Measurement uncertainty and significant figures

Read a ruler to the right precision, state an uncertainty, and carry it through a calculation. Worked on a pencil's length, width and area.

Nov 12, 2026DuckyHelper

Mecanum wheels and moving sideways

See how mecanum wheels with 45-degree rollers let a robot strafe and rotate, with wheel directions, force components and floor limits.

Nov 12, 2026DuckyHelper

Meeting notes that lead to action

Take meeting notes that capture decisions, actions, owners and dates, and send them within an hour. Includes a note template and a worked example.

Nov 12, 2026DuckyHelper

Getting work done

Microcontrollers vs single-board computers

Learn when a robot needs a microcontroller, a single-board computer or both: real-time control, running an operating system, power and a serial link.

Nov 12, 2026DuckyHelper

Mitosis and meiosis compared

Compare mitosis and meiosis by following a human cell with 46 chromosomes: the phases, diploid versus haploid, and why meiosis creates variety.

Nov 12, 2026DuckyHelper

Mnemonics: when they help and when they don't

Acronyms and rhymes help you recall an order but not why it is that order. See where PEMDAS helps and where it misleads, and how to pair it with examples.

Nov 12, 2026DuckyHelper

Model predictive control in plain words

Model predictive control predicts, optimizes, acts and repeats. See a robot car compare steering options over the next second and pick the best.

Nov 12, 2026DuckyHelper

Molarity and dilution

Molarity is moles per litre. Learn M₁V₁ = M₂V₂ by diluting a 2 M stock to 0.5 M, plus the lab steps for making a solution safely.

Nov 12, 2026DuckyHelper

Momentum and collisions

Understand momentum and its conservation by solving two carts that stick together, then compare with an elastic collision and check energy.

Nov 12, 2026DuckyHelper

Motor drivers and H-bridges

Why a microcontroller pin cannot run a motor, how an H-bridge reverses and speeds it, and what flyback protection does, with an example.

Nov 12, 2026DuckyHelper

Moving data between two apps with an assistant

How an assistant moves rows from a PDF into a spreadsheet: read the table, map the fields, and check the totals so nothing is lost or mistyped.

Nov 12, 2026DuckyHelper

AI on your computer

Multiple choice strategy that works on any test

Answer before you look at the choices, eliminate what cannot be right, and flag and return. Shown by eliminating answers on a chemistry question.

Nov 12, 2026DuckyHelper

Naming files so anyone can find them

A simple file naming convention with YYYY-MM-DD dates and version numbers, plus a worked example and how to rename old files without chaos.

Nov 12, 2026DuckyHelper

Getting work done

Newton's second law with a shopping cart

Learn F = ma by pushing a 10 kg cart: find the net force, add friction, solve for acceleration, and check your units and answer.

Nov 12, 2026DuckyHelper

Obstacle avoidance with a potential field

Steer a robot by an attractive force toward the goal and repulsive forces from obstacles, with a computed example and the local-minimum trap.

Nov 12, 2026DuckyHelper

Occupancy grid maps

How a robot turns range readings into an occupancy grid: free, occupied and unknown cells, with a 5 cm room example and log-odds updates.

Nov 12, 2026DuckyHelper

Odometry and why its errors add up

See how wheel odometry estimates position from encoder counts, why a half-millimeter wheel error becomes a metre-scale miss, and how to correct it.

Nov 12, 2026DuckyHelper

Ohm's law and simple circuits

Learn V = IR with a 9 V battery across a 450 ohm resistor: find 20 mA, the power in the resistor, and what changes with two in series.

Nov 12, 2026DuckyHelper

Optimization: the biggest open box from a square sheet

Cut squares from the corners of a 12 by 12 sheet to build the biggest open box: write the volume, set its derivative to zero and verify the maximum.

Nov 12, 2026DuckyHelper

Orbits: why the Moon keeps falling and never lands

Throw a ball faster and faster until it falls around the Earth. Work out orbital speed near the surface (about 7.9 km/s) and the Moon's fall.

Nov 12, 2026DuckyHelper

Organizing a shared drive

How to set up a shared drive a small team can actually use: top-level folders, permissions, naming and an archive, with a worked example.

Nov 12, 2026DuckyHelper

Getting work done

Organizing receipts so tax time is easy

A simple folder and file-naming system for receipts, with monthly folders, backups and a ten-minute weekly routine that keeps paperwork under control.

Nov 12, 2026DuckyHelper

Getting work done

Organizing research notes so you can find them later

Organize research notes in any notes app: one note per source, a few consistent tags and summary notes, shown on a month of research.

Nov 12, 2026DuckyHelper

Getting work done

Osmosis and the cell membrane

Learn osmosis, hypertonic, hypotonic and isotonic solutions, and work out the isotonic point from potato slice mass data.

Nov 12, 2026DuckyHelper

Oxidation and reduction

Redox is the transfer of electrons. Track iron rusting with oxidation numbers, use OIL RIG, and see how the same idea powers a battery.

Nov 12, 2026DuckyHelper

Pair programming with an assistant that sees your editor

How to fix a failing test with an assistant watching your editor: describe intent, work in small steps and stay in control of every change.

Nov 12, 2026DuckyHelper

AI on your computer

Particle filters with a robot in a hallway

Follow a particle filter in a corridor with doors: particles, weights and resampling, worked through with ten particles and real numbers.

Nov 12, 2026DuckyHelper

Password hygiene for a small team

Roll out a password manager, unique passwords and two-factor sign-in for a small team, with a week-by-week plan and rules about never sharing codes.

Nov 12, 2026DuckyHelper

Getting work done

Path planning with A* on a grid

Trace A* on a five by five grid with walls: open and closed lists, costs g and h, and how the heuristic steers the search to the goal.

Nov 12, 2026DuckyHelper

Paying bills on time without missing one

Set up a bill calendar with due dates, early reminders and a monthly check, plus honest cautions about autopay and approvals before money leaves.

Nov 12, 2026DuckyHelper

Getting work done

Percent change without the common mistakes

Compute a rise from 40 to 50 dollars as +25%, see why the fall back is only −20%, and why successive changes do not simply add.

Nov 12, 2026DuckyHelper

Periodic trends: atomic radius and electronegativity

Why atoms shrink across a period and grow down a group, and why electronegativity does the opposite. Worked across period 3 with effective nuclear charge.

Nov 12, 2026DuckyHelper

Permutations and combinations: when order matters

Choose 3 of 5 people: 10 groups but 60 ordered lineups. Learn factorials, nPr versus nCr, and check by listing a small case.

Nov 12, 2026DuckyHelper

pH and the logarithmic scale

pH = −log[H⁺] turns tiny concentrations into small numbers. See why each pH step is a factor of ten, with pH 3 versus pH 4 worked out.

Nov 12, 2026DuckyHelper

PID control explained with a line-following robot

How P, I and D terms steer a line-following robot, with the error from a sensor array and one step computed in full.

Nov 12, 2026DuckyHelper

Pivot tables for the first time

Build your first pivot table step by step: pick rows, columns and values, add a filter, and refresh it, using total sales by region and month.

Nov 12, 2026DuckyHelper

Getting work done

Planning a content calendar

Plan a month of posts in one sheet: themes, dates, owners and status, with formulas that show what is ready, what is late and what is missing.

Nov 12, 2026DuckyHelper

Getting work done

Planning a one-day event agenda

Build a one-day workshop agenda from 9 to 5 with blocks, breaks and buffers, an owner for every session, and a total that adds up to the minute.

Nov 12, 2026DuckyHelper

Getting work done

Planning a trip without twenty open tabs

Put a whole trip in one sheet: budget, bookings, itinerary and documents, with a worked weekend example and formulas that add up.

Nov 12, 2026DuckyHelper

Getting work done

Point clouds: filtering and segmenting what a robot sees

Learn what a point cloud is, how downsampling and plane fitting remove the floor, and how clusters turn leftover points into separate objects.

Nov 12, 2026DuckyHelper

Pointing at something and asking "what's this?"

How pointing with your cursor helps an assistant know what "this" means, with a word-on-screen example and tips for getting a good answer.

Nov 12, 2026DuckyHelper

AI on your computer

Power budgets: will your battery last the demo?

Add up the current of motors, sensors and a computer, convert to watts and watt-hours, and estimate battery runtime with a safety margin.

Nov 12, 2026DuckyHelper

Practical ways to handle test nerves on the day

Nerves before a test are normal. Use a morning routine, slow breathing, early arrival, an easy first question and timed practice beforehand.

Nov 12, 2026DuckyHelper

Practicing a language with an assistant that listens

How speaking practice with a listening assistant works: role-play ordering food in Spanish, get corrections and work on pronunciation.

Nov 12, 2026DuckyHelper

AI on your computer

Predicting molecule shapes with VSEPR

Count electron domains to predict molecule shape. Methane is tetrahedral at 109.5°, and lone pairs turn the same layout into pyramidal or bent shapes.

Nov 12, 2026DuckyHelper

Preparing a quote

Prepare a clear quote: line items, quantities, a discount line, correct totals and a validity date, with the arithmetic checked step by step.

Nov 12, 2026DuckyHelper

Getting work done

Preparing for a lab practical

Prepare for timed station exams: practise with photos and labels, drill stations on a clock, and know the lab safety rules. A heart-model example.

Nov 12, 2026DuckyHelper

Preparing for a math placement test

Review algebra and functions without a calculator: fractions, exponents, equations and function notation. A worked review list with solved checks.

Nov 12, 2026DuckyHelper

Preparing for an oral exam

Practise answers out loud to likely questions, outline instead of scripting, record yourself, and learn how to handle a question you cannot answer.

Nov 12, 2026DuckyHelper

Pressure in fluids and tires

Pressure is force per area. Work out why a thumbtack goes in point first, how pressure grows with depth, and what tire gauges really read.

Nov 12, 2026DuckyHelper

Probability basics with dice

List the 36 outcomes of two dice, find the chance of a sum of 7 as 6 out of 36, and use complements for "at least one" questions.

Nov 12, 2026DuckyHelper

Program a robot to drive a square

Drive a two-wheel robot around a square with dead reckoning, work out the wheel turns, and see why the square never quite closes.

Nov 12, 2026DuckyHelper

Projectile motion: why horizontal and vertical are separate

See why projectile motion splits into independent horizontal and vertical parts, then work out a 20 m/s throw at 30 degrees for time and range.

Nov 12, 2026DuckyHelper

Pronunciation practice with minimal pairs

Train your ear and mouth with minimal pairs, such as ship and sheep, using mouth position, listening drills and recordings of yourself.

Nov 12, 2026DuckyHelper

Proofreading what you are about to send

Ask an AI assistant to list issues in a cover letter instead of rewriting it, make the changes yourself, and never let it send for you without asking.

Nov 12, 2026DuckyHelper

AI on your computer

Protecting formulas from accidental edits

Lock the formula cells in a shared spreadsheet, leave input cells open, set who can edit, and document the rules so the sheet survives other people.

Nov 12, 2026DuckyHelper

Getting work done

Punnett squares step by step

Learn to set up a Punnett square, read the 1:2:1 genotype and 3:1 phenotype ratios from a Bb × Bb cross, and use a test cross.

Nov 12, 2026DuckyHelper

PWM: controlling speed with fast switching

See how pulse-width modulation sets motor speed and LED brightness by switching fully on and off quickly, with duty cycle and frequency worked out.

Nov 12, 2026DuckyHelper

Radians: why 180 degrees equals π

Define a radian as the angle whose arc equals the radius, derive 180° = π radians, convert both ways and see why calculus prefers radians.

Nov 12, 2026DuckyHelper

Ratios and proportions with maps and recipes

Use a 1:50,000 map scale and a cookie recipe to set up proportions, find unit rates, cross multiply and keep the units straight.

Nov 12, 2026DuckyHelper

Reading a box plot

Build a five-number summary from 11 test scores, find the quartiles and interquartile range, apply the 1.5 × IQR outlier rule and read the box.

Nov 12, 2026DuckyHelper

Reading a cladogram

Learn to read a cladogram: branch points, common ancestors and shared derived traits, using a five-animal example you can redraw yourself.

Nov 12, 2026DuckyHelper

Reading a dense PDF with an assistant

Read a difficult PDF one paragraph at a time with an assistant: ask about definitions, check the summaries, and keep the paper's own words in view.

Nov 12, 2026DuckyHelper

AI on your computer

Reading a graph from a biology experiment

A step-by-step method for reading a biology graph: axes and units, the trend, rates of change and conclusions the data really supports.

Nov 12, 2026DuckyHelper

Reading a historical map

Read a historical map by checking its legend, scale and date, using Silk Road trade routes as the example, and note what the map leaves out.

Nov 12, 2026DuckyHelper

Reading a profit and loss statement

Learn to read a profit and loss statement top to bottom: revenue, costs, gross and net profit, and the margins you can calculate yourself from the lines.

Nov 12, 2026DuckyHelper

Getting work done

Reading a sensor with a microcontroller

See how a microcontroller turns a light sensor's voltage into numbers: voltage dividers, the ADC, digital thresholds and pull-up resistors, with the math.

Nov 12, 2026DuckyHelper

Reading a site's terms before you sign up

Find the cancellation terms in a sign-up page, learn which clauses to read first, and use a summary as a guide. Not legal advice.

Nov 12, 2026DuckyHelper

AI on your computer

Reading graded readers

Choose a graded reader at the right level, read for the story without looking up every word, and reread to lock in the language.

Nov 12, 2026DuckyHelper

Reading text on a screen: OCR explained

OCR turns pictures of letters into real text. See how a screenshot of a table becomes copyable rows, and where it goes wrong.

Nov 12, 2026DuckyHelper

AI on your computer

Reading word problems without panic

A calm, repeatable way to read a word problem: underline quantities, define variables with units, estimate first, then write the equation.

Nov 12, 2026DuckyHelper

Reading your score report and choosing what to study next

How to read the skill categories on a test score report, rank them by how many questions you missed, and turn the result into a five-item study list.

Nov 12, 2026DuckyHelper

Reconciling bank transactions in a spreadsheet

Match a bank statement to your own records, flag the differences, and prove the ending balance, with formulas that work in Excel and Google Sheets.

Nov 12, 2026DuckyHelper

Getting work done

Recovering when an agent makes a mistake

What to do when an AI agent gets something wrong: stop, review the record, undo carefully, and why risky steps should wait for your approval.

Nov 12, 2026DuckyHelper

AI on your computer

Recursion explained with factorials

Understand recursion through 5! = 120: the base case, the recursive case and how the call stack builds up and unwinds.

Nov 12, 2026DuckyHelper

Computer science

Reference check questions that tell you something

Ask references for specific examples, use the same questions each time and get consent first, with five questions you can adapt.

Nov 12, 2026DuckyHelper

Getting work done

Refraction: why a straw looks bent in water

Why light bends when it changes medium, how to use Snell's law for light entering water, and when total internal reflection happens.

Nov 12, 2026DuckyHelper

Reinforcement learning for robots, explained plainly

Understand rewards, trials and policies by rewarding a simulated robot for staying upright, and see why simulation is where this learning starts.

Nov 12, 2026DuckyHelper

Related rates: the sliding ladder

Solve the classic sliding ladder problem: draw, label, relate the variables, differentiate in time and substitute at the moment asked.

Nov 12, 2026DuckyHelper

Renaming lots of files at once

Rename a whole folder of files in one pass on a Mac or Windows PC, with a preview first, using 100 camera photos as the example.

Nov 12, 2026DuckyHelper

Getting work done

Replying to a customer complaint by email

A calm four-step structure for answering a complaint: acknowledge, explain, fix, follow up. Includes a worked example for a late delivery, with no blame.

Nov 12, 2026DuckyHelper

Getting work done

Researching a prospect before a sales call

A ten-minute routine for preparing a sales call: company basics, recent news, the person you are talking to, and questions to ask.

Nov 12, 2026DuckyHelper

Getting work done

Researching across many tabs with an assistant

How to compare several articles at once with an assistant: pull out claims, keep sources and notes, and verify every summary.

Nov 12, 2026DuckyHelper

AI on your computer

Returning an online order step by step

How to return an online order: check the return policy, pack it, print the label, track the parcel and confirm the refund, with a worked example.

Nov 12, 2026DuckyHelper

Getting work done

Reviewing a practice test you did badly on

Sort every missed question into concept gap, careless slip or time, then give each cause its own fix. Shown with 12 missed questions.

Nov 12, 2026DuckyHelper

Reviewing a whole semester for a cumulative final

Compress a semester into five big ideas, review them in spaced passes over two weeks, and use old tests as practice. A physics example.

Nov 12, 2026DuckyHelper

Revising a draft in three passes

Revise in three passes, from structure to paragraphs to sentences, and watch one paragraph improve at each step.

Nov 12, 2026DuckyHelper

Robot arms in factories: repeatability vs accuracy

Learn the difference between repeatability and accuracy with measurements from an arm returning to one spot, and why calibration fixes only one of them.

Nov 12, 2026DuckyHelper

Robot ethics: who is responsible when a robot fails

Use a delivery robot stuck on a narrow sidewalk to see how design, operation and oversight share responsibility, and why accessibility matters.

Nov 12, 2026DuckyHelper

ROS 2 launch files and parameters

Start a whole ROS 2 robot with one command: write a launch file, load node settings from a YAML parameter file, and use namespaces to avoid clashes.

Nov 12, 2026DuckyHelper

Running a shared team calendar

Set up a shared team calendar for leave and deadlines with clear naming conventions, sensible permissions and colors that carry meaning.

Nov 12, 2026DuckyHelper

Getting work done

Running a task every week with an assistant

How to hand a repeating job to an assistant: a weekly report walked through, what to check before automating, and when to keep a person in the loop.

Nov 12, 2026DuckyHelper

AI on your computer

Running a weekly pipeline review

Run a 30-minute weekly pipeline review: stage criteria, spotting stuck deals, and ending with a next step for every deal, with a ten-deal example.

Nov 12, 2026DuckyHelper

Getting work done

Sampling-based planning: RRT in plain words

How RRT grows a random tree through configuration space to plan an arm around an obstacle, with two steps worked out and why grids fail.

Nov 12, 2026DuckyHelper

SAT grammar rules that come up again and again

The grammar rules that keep returning in SAT Writing questions: sentence boundaries, agreement, apostrophes and transitions, with worked fixes.

Nov 12, 2026DuckyHelper

SAT reading and writing: one passage, one question

A repeatable method for SAT Reading and Writing questions: read the question first, predict an answer, then eliminate choices using evidence from the text.

Nov 12, 2026DuckyHelper

Saying no politely by email

A short formula for declining by email: thank, decline, offer an alternative or nothing. Includes a worked example declining a meeting request.

Nov 12, 2026DuckyHelper

Getting work done

Scheduling a meeting with people outside your company

Schedule a meeting with someone outside your company: offer three clear time slots in their time zone, include the link and send a confirmation.

Nov 12, 2026DuckyHelper

Getting work done

Scheduling interviews without endless emails

Offer a few clear interview slots in one message, handle time zones and send reminders, with a worked example of five candidates in one week.

Nov 12, 2026DuckyHelper

Getting work done

Scheduling social posts ahead of time

Batch a week of social posts in one sitting: plan, write, set times with time zones in mind, review, and avoid the common scheduling slips.

Nov 12, 2026DuckyHelper

Getting work done

Screening resumes fairly with a rubric

Screen resumes with a rubric written before you read any: five criteria, a simple score and checks that keep the process consistent.

Nov 12, 2026DuckyHelper

Getting work done

Seeing physics move with a simulation

Why a moving simulation explains physics better than a formula, using a pendulum to show what changing one variable at a time reveals.

Nov 12, 2026DuckyHelper

AI on your computer

Sensor noise and how to smooth it

Why sensor readings jitter, how a moving average and a median filter clean them up, and the delay you pay for it, with numbers.

Nov 12, 2026DuckyHelper

Series and parallel circuits

Learn how current and voltage behave in series and parallel circuits, and work out two 100 ohm resistors as 200 ohms in series and 50 in parallel.

Nov 12, 2026DuckyHelper

Servo motors and how they hold a position

How a hobby servo turns a pulse width into a shaft angle and holds it, with a worked example, plus the limits that make servos stall.

Nov 12, 2026DuckyHelper

Setting an out-of-office that actually helps

Write an out-of-office reply that helps senders: your dates, a backup contact, and what can wait. Includes a worked example you can adapt.

Nov 12, 2026DuckyHelper

Getting work done

Setting up your desk and phone before you study

A ten-minute setup checklist for focus: phone out of reach, one tab, water and materials ready, and a written goal for the session.

Nov 12, 2026DuckyHelper

Sharing files securely at work

Share a sensitive file with someone outside your company using specific people, the lowest role that works, an expiry, and a check afterwards.

Nov 12, 2026DuckyHelper

Getting work done

Showing progress as plain steps instead of jargon

Why an assistant that works in your apps should report plain-English steps and clear done signals, shown with a booking example.

Nov 12, 2026DuckyHelper

AI on your computer

Sim-to-real: why simulated robots stumble in reality

A walking policy that never slips in simulation slips on a real floor. See the friction numbers, then domain randomization and system identification.

Nov 12, 2026DuckyHelper

Similar triangles: measuring a tree with its shadow

Find a tree's height from shadows with similar triangles: a 1.5 m stick with a 2 m shadow gives a 9 m tree when its shadow is 12 m.

Nov 12, 2026DuckyHelper

Simulate a two-wheel robot before you build it

Model a two-wheel robot in a few lines of code, drive it with keyboard commands and check its motion against hand math before any hardware exists.

Nov 12, 2026DuckyHelper

Sine and cosine graphs: amplitude, period and shift

Read amplitude, period 2π/b and phase shift off an equation like y = 3 sin(2x), then sketch the wave from five key points.

Nov 12, 2026DuckyHelper

SLAM explained: mapping and localizing at once

Why a robot in a new place must build a map and locate itself at the same time, and how SLAM splits into a front end and a back end.

Nov 12, 2026DuckyHelper

Slope as a rate of change

Understand slope as "how much y changes per one x" using a phone plan with a fixed fee and a cost per gigabyte.

Nov 12, 2026DuckyHelper

Smooth trajectories for robot arms

Plan a smooth joint motion with a cubic polynomial from start to goal, check position, velocity and acceleration limits, and see what jerk means.

Nov 12, 2026DuckyHelper

Soft robotics: robots made of flexible materials

How pneumatic soft robots bend with air pressure: the force-equals-pressure-times-area idea, an air-powered gripper worked out, and safe handling.

Nov 12, 2026DuckyHelper

SOH CAH TOA and when to use each ratio

Label opposite, adjacent and hypotenuse from the angle you are using, pick sine, cosine or tangent, and find the angle of a ladder.

Nov 12, 2026DuckyHelper

Soldering basics for robot builders

Solder a pin header to a sensor board the safe way: heat the joint not the solder, check the joint, and handle fumes, burns and eye risks.

Nov 12, 2026DuckyHelper

Solubility rules and precipitates

Predict when mixing two salt solutions makes a solid. Silver nitrate plus sodium chloride gives AgCl, shown as a net ionic equation with spectator ions.

Nov 12, 2026DuckyHelper

Solving absolute value equations

Solve |2x − 3| = 7 by splitting into two cases, check both answers, spot extraneous solutions and read the equation as a distance.

Nov 12, 2026DuckyHelper

Solving systems of equations by elimination

Solve 2x + 3y = 12 and x − y = 1 by scaling and adding, check in both equations, and know when substitution is the easier route.

Nov 12, 2026DuckyHelper

Sorting algorithms compared

Trace bubble sort, merge sort and quicksort on [5, 2, 9, 1], with working Python for each and when you would choose each one.

Nov 12, 2026DuckyHelper

Computer science

Sorting newsletters automatically with filters

Set up a mail filter or rule that files newsletters out of your inbox: match by sender or words, skip the inbox, and test on old mail first.

Nov 12, 2026DuckyHelper

Getting work done

Speaking practice with no partner

Practise speaking a language alone: shadow an audio clip using listen, repeat, record, compare, then talk to yourself about your day.

Nov 12, 2026DuckyHelper

Splitting full names into first and last

Split a Full name column into first and last name columns with Text to Columns, formulas, SPLIT or TEXTSPLIT, and handle middle names safely.

Nov 12, 2026DuckyHelper

Getting work done

Springs and simple harmonic motion

Hooke's law and the period T = 2π√(m/k), worked through a 0.50 kg mass on a 200 N/m spring, with the energy swapping back and forth.

Nov 12, 2026DuckyHelper

Standard deviation by hand

Compute the standard deviation of 2, 4, 4, 4, 5, 5, 7, 9 step by step, see why we square, and learn when to divide by n or n − 1.

Nov 12, 2026DuckyHelper

State machines for robot behavior

Organize robot behavior as states, events and transitions. Draw the diagram first, then code a patrol, chase and return robot.

Nov 12, 2026DuckyHelper

Static and dynamic balance in legged robots

Compare static and dynamic balance in legged robots using stability margins and an inverted-pendulum model, with the time scale of a fall.

Nov 12, 2026DuckyHelper

Static and kinetic friction

Why a heavy couch is hardest to start moving: static versus kinetic friction, the two coefficients, and a pushing problem worked with numbers.

Nov 12, 2026DuckyHelper

Staying on track in an online class

Keep a self-paced online course moving with deadlines in one calendar, a fixed weekly class time and a Friday check-in. Includes a weekly checklist.

Nov 12, 2026DuckyHelper

Stepper motors: moving in exact steps

How stepper motors move in fixed steps, with the 200 steps per revolution example, microstepping, holding torque and missed steps.

Nov 12, 2026DuckyHelper

Stoichiometry step by step

Use a balanced equation and mole ratios to go from grams of one substance to grams of another. Worked on 16 g of methane burning to 44 g of CO₂.

Nov 12, 2026DuckyHelper

Studying the night before a test, when you have no choice

If the test is tomorrow, triage. Pick the highest-value topics, practice problems instead of rereading, and protect your sleep. A three-hour plan.

Nov 12, 2026DuckyHelper

Studying with a group without wasting the hour

A 60-minute agenda for a study group with roles, a closed-notes quiz and one problem explained aloud per person, so the hour does not drift into chat.

Nov 12, 2026DuckyHelper

SUMIFS and COUNTIFS for quick reports

Use SUMIFS and COUNTIFS to total and count rows by several criteria, such as sales by rep and month, with wildcards and equal-size ranges.

Nov 12, 2026DuckyHelper

Getting work done

Summarizing a long article on screen

Turn a long article into five points with an assistant, then check each point against the text so the summary stays honest.

Nov 12, 2026DuckyHelper

AI on your computer

Summarizing a long email thread for someone new

Turn a long email thread into a short summary a newcomer can act on: decisions, open questions, owners and dates, with a 30-message worked example.

Nov 12, 2026DuckyHelper

Getting work done

Swarm robotics: many simple robots working together

See how many simple robots cover an area using only local rules, how group behavior emerges, and what communication limits do to it.

Nov 12, 2026DuckyHelper

Tagging support tickets for useful reports

How to tag support tickets so monthly counts mean something: a short tag list, written definitions and one tag per ticket, with a worked six-tag example.

Nov 12, 2026DuckyHelper

Getting work done

Taking notes from a video lecture

Pause and predict, timestamp your questions and write a summary from memory at the end. Shown with notes from a 15-minute physics video.

Nov 12, 2026DuckyHelper

Testing a web form before it goes live

Test a signup form before real people use it: required fields, error messages, mobile screens and the confirmation, with a checklist you can reuse.

Nov 12, 2026DuckyHelper

Getting work done

The AP English Language rhetorical analysis essay

Analyze how a writer's choices create effects for an audience, using specific evidence. Shown on the first paragraph of the Gettysburg Address.

Nov 12, 2026DuckyHelper

The carbon cycle

Follow one carbon atom through photosynthesis, respiration, decay, the ocean and fossil fuels to understand stores, flows and the carbon cycle.

Nov 12, 2026DuckyHelper

The chain rule with one picture

Differentiate (3x + 1)⁵ by treating it as an outer power and an inner line, see why rates multiply, and verify with a smaller power.

Nov 12, 2026DuckyHelper

The digestive system step by step

Follow a sandwich from mouth to intestine and see where mechanical and chemical digestion happen, which enzymes act and where absorption occurs.

Nov 12, 2026DuckyHelper

The Feynman technique, tried on photosynthesis

Explain photosynthesis to a 12-year-old, find where your explanation breaks, and fix those gaps. A full run of the Feynman technique.

Nov 12, 2026DuckyHelper

The first five minutes of any exam

Scan the paper, write down formulas you might forget, plan time by points and start with a confident question. A worked time allocation.

Nov 12, 2026DuckyHelper

The five-paragraph essay and when to move past it

See one essay outlined as a five-paragraph essay and as a longer structure, and learn which one fits your assignment.

Nov 12, 2026DuckyHelper

The fundamental theorem of calculus in plain words

Connect slope and area: compute the integral of 2x from 0 to 2 as 4 with an antiderivative, and see why accumulated area has a rate equal to the height.

Nov 12, 2026DuckyHelper

The gas laws in one equation

PV = nRT covers Boyle's and Charles's laws. Work out why a balloon shrinks in a freezer, and why temperature must be in kelvin.

Nov 12, 2026DuckyHelper

The immune system's two lines of defense

Compare innate and adaptive immunity by following what happens after a cut on your finger, from skin and inflammation to antibodies.

Nov 12, 2026DuckyHelper

The Jacobian: how joint speeds become hand speed

Compute a two-link arm's hand velocity from joint speeds with the Jacobian matrix, and see why a straight-arm singularity needs extreme joint speeds.

Nov 12, 2026DuckyHelper

The Kalman filter without heavy math

The Kalman filter explained as weighted averaging: fuse a prediction and a measurement by their uncertainty, with a full predict and update cycle.

Nov 12, 2026DuckyHelper

The method of loci: memorizing a list in order

Memorize an ordered list by placing vivid images along a route you know well. Shown with the first ten elements of the periodic table.

Nov 12, 2026DuckyHelper

The mole, explained with a dozen

A mole is a counting number like a dozen, just much bigger. Learn Avogadro's number and molar mass, and see why 18 g of water is one mole.

Nov 12, 2026DuckyHelper

The power rule and where it comes from

Derive d/dx of x³ from the limit definition by expanding (x + h)³, spot the pattern for xⁿ and use it on polynomials and roots.

Nov 12, 2026DuckyHelper

The Pythagorean theorem and a proof you can draw

See why a² + b² = c² with a square-in-a-square drawing, test it on a 3-4-5 triangle, then use the converse and the distance formula.

Nov 12, 2026DuckyHelper

The robotics math you actually need

A turning robot shows the math a beginner needs: trig for headings, vectors for motion, a rotation matrix for frames, and when calculus appears.

Nov 12, 2026DuckyHelper

The unit circle without memorizing a table

Rebuild every common sine and cosine value from two special triangles, a symmetry rule and a sign rule, starting with sin 30° = 1/2.

Nov 12, 2026DuckyHelper

Things an AI agent should never do without asking

The actions an AI agent should always check with you first, including sending, paying, deleting and sharing, and why each one earns a pause.

Nov 12, 2026DuckyHelper

AI on your computer

Thinking out loud with a voice assistant

How talking through a problem aloud helps you think, shown on a physics problem, and how to use follow-up questions with a voice assistant.

Nov 12, 2026DuckyHelper

AI on your computer

Three ways to define acids and bases

Compare the Arrhenius, Brønsted-Lowry and Lewis definitions on real reactions, and find conjugate acid-base pairs in ammonia reacting with water.

Nov 12, 2026DuckyHelper

Time blocking a work week

Plan a work week by placing meetings first, then big tasks, buffers and a Friday review in your calendar. Includes a worked 40-hour example.

Nov 12, 2026DuckyHelper

Getting work done

Topic sentences that guide the reader

Learn what a topic sentence does, then watch three weak ones get rewritten so each paragraph holds one idea tied to the thesis.

Nov 12, 2026DuckyHelper

Torque and levers

Learn torque as force times distance from the pivot, then balance a seesaw with numbers and meet the three classes of lever.

Nov 12, 2026DuckyHelper

Tracking candidates in a spreadsheet

Build a hiring pipeline sheet with stages, dates, notes and a dropdown, plus formulas to count each stage, with privacy in mind.

Nov 12, 2026DuckyHelper

Getting work done

Tracking links with UTM parameters

Tag links with utm_source, utm_medium and utm_campaign so you can tell which email or post sent each visit. Includes a newsletter example and naming rules.

Nov 12, 2026DuckyHelper

Getting work done

Tracking tasks on a kanban board

Set up a simple kanban board with four columns, work in progress limits and clear definitions of done, using any board or even sticky notes.

Nov 12, 2026DuckyHelper

Getting work done

Training your pacing with timed practice

Learn how long you really take per question. Set checkpoints, decide when to skip, and practise with the clock. A 60-minute, 30-question example.

Nov 12, 2026DuckyHelper

Transitions that show how ideas connect

Learn the four jobs transitions do and revise a paragraph that has none, so ideas connect instead of just sitting side by side.

Nov 12, 2026DuckyHelper

Translating a customer email you can't read

Translate a customer email in a language you do not read, check what it really means, and reply in short, plain language, with a Portuguese example.

Nov 12, 2026DuckyHelper

Getting work done

Translating what is on your screen

How in-place translation of a menu or page works, why context matters, and the errors to watch for before you rely on it.

Nov 12, 2026DuckyHelper

AI on your computer

Triaging a support inbox in the morning

A 20-minute routine for sorting a morning support inbox: urgency versus importance, tags and quick first replies, with 40 new tickets as the example.

Nov 12, 2026DuckyHelper

Getting work done

Troubleshooting your computer with an assistant

How an AI assistant helps fix computer problems: the step-by-step checks it suggests, how it reads error dialogs, and when you should stop.

Nov 12, 2026DuckyHelper

AI on your computer

Tuning a PID controller step by step

A method for tuning a PID controller on a wheel speed loop: raise P, add D for overshoot, add I for steady error, and log everything.

Nov 12, 2026DuckyHelper

Turning a customer message into a good bug report

How to turn a vague customer message into a bug report engineers can use: steps to reproduce, expected vs actual and environment, with a checkout example.

Nov 12, 2026DuckyHelper

Getting work done

Turning a website into actions an assistant can call

A website's buttons and forms are really requests. See how a booking site's search form becomes one action an assistant can call, instead of many clicks.

Nov 12, 2026DuckyHelper

AI on your computer

Turning emails into calendar events

Turn an event invite buried in an email into a correct calendar event: copy the details, set reminders, add the link and attach the right files.

Nov 12, 2026DuckyHelper

Getting work done

Turning interview notes into findings

How to turn eight interviews of messy notes into themes, counts like "5 of 8" and quotes as evidence, with a worked example and a spreadsheet count.

Nov 12, 2026DuckyHelper

Getting work done

Turning meeting notes into CRM updates

Turn raw meeting notes into a clean CRM update: stage, amount, next step and contacts, with a worked example of updating a deal after a call.

Nov 12, 2026DuckyHelper

Getting work done

Turning notes into a task list

Turn a page of messy notes into clear tasks: start each with a verb, give each an owner and a date, and sort out what is not a task. Worked example.

Nov 12, 2026DuckyHelper

Getting work done

Turning notes into slides

Turn a page of notes into a short slide deck: find the one message, give each slide one idea, add visuals and keep detail in speaker notes.

Nov 12, 2026DuckyHelper

Getting work done

Turning ten articles into a one-page brief

Turn ten articles into a one-page brief: skim, extract, synthesize, and cite each claim, shown with a worked example on a made-up regulation.

Nov 12, 2026DuckyHelper

Getting work done

Tutoring help vs answer apps: what actually helps you learn

The same algebra problem solved two ways, an answer and a guided walk-through, and why one builds the skill you need on test day.

Nov 12, 2026DuckyHelper

AI on your computer

Types of genetic mutations

Compare silent, missense, nonsense and frameshift mutations by editing one short mRNA and translating each version.

Nov 12, 2026DuckyHelper

Ultrasonic distance sensors and their blind spots

Turn an ultrasonic echo time into distance with the speed of sound, then see why cone width, soft surfaces and angled walls cause blind spots.

Nov 12, 2026DuckyHelper

Understanding a bill or statement on screen

Read a phone bill line by line: how an assistant explains definitions, checks the totals, and what to protect before you share a statement.

Nov 12, 2026DuckyHelper

AI on your computer

Understanding error messages with an assistant

Read an error message properly, find the cause on screen, and use an assistant to explain it. Worked on a spreadsheet #VALUE! error.

Nov 12, 2026DuckyHelper

AI on your computer

Units and dimensional analysis

Convert 72 km/h to 20 m/s with a conversion chain, then use units to catch wrong formulas before you trust them. Includes squared-unit traps.

Nov 12, 2026DuckyHelper

URDF: describing a robot so software can use it

Learn how a URDF file lists a robot's links and joints, builds a two-link arm step by step, and separates visual from collision geometry.

Nov 12, 2026DuckyHelper

Using an AI assistant for homework without cheating yourself

How to use an AI assistant for homework so you learn instead of just finishing: ask for a hint, explain it back, and follow your school's rules.

Nov 12, 2026DuckyHelper

AI on your computer

Using an assistant hands-free while you take notes

How to ask an AI assistant short questions out loud while your hands stay on your notebook, with a worked walk-through, limits and privacy tips.

Nov 12, 2026DuckyHelper

AI on your computer

Using evidence: quote, paraphrase, explain

Learn to introduce, cite and explain evidence, using a short passage from Frederick Douglass as a worked example.

Nov 12, 2026DuckyHelper

Using one assistant on Mac, Windows and Linux

How one assistant works the same way on Mac, Windows and Linux: which key to press, what stays the same, and where the permissions differ.

Nov 12, 2026DuckyHelper

AI on your computer

Using practice tests to decide what to study next

Mark every miss and every guess on a practice test, group them by topic, and plan your next three sessions. Shown with a 40-question example.

Nov 12, 2026DuckyHelper

Using the built-in graphing calculator on the digital SAT

When graphing beats algebra on the digital SAT, how to read an intersection point, and how to check it with substitution so you trust the answer.

Nov 12, 2026DuckyHelper

Using the last ten minutes of an exam

Spend the final ten minutes on a checklist: unanswered questions first, then flagged ones, then units and signs. A worked ten-minute plan.

Nov 12, 2026DuckyHelper

Variables, loops and conditionals in Python

Use variables, a for loop, if/elif/else and the modulo operator to solve FizzBuzz from 1 to 15 in Python, and trace the output.

Nov 12, 2026DuckyHelper

Computer science

Vectors: adding forces and velocities

Add vectors by components: 3 units east plus 4 units north has magnitude 5, find the direction with inverse tangent, and use it for a boat in a current.

Nov 12, 2026DuckyHelper

Vendor payment approvals

Set up a simple two-step approval for vendor invoices: who checks, who approves, thresholds by amount, and the records to keep, with an example log.

Nov 12, 2026DuckyHelper

Getting work done

Version control with git for beginners

Learn commits, branches and merging with git by making one change on a branch and merging it back, with good commit messages.

Nov 12, 2026DuckyHelper

Computer science

Viruses and bacteria compared

Compare viruses and bacteria by size, structure and reproduction, and see why antibiotics work on bacteria but not on viruses.

Nov 12, 2026DuckyHelper

Visual servoing: steering with a camera

Learn visual servoing by centering a target in the image: turn pixel error into a turn rate, run the feedback loop, and see when gain is too high.

Nov 12, 2026DuckyHelper

VLOOKUP vs XLOOKUP: looking up a value in another table

Look up a value in another table with VLOOKUP or XLOOKUP: exact match, handling not-found errors, and which versions have XLOOKUP, with a price example.

Nov 12, 2026DuckyHelper

Getting work done

Walking gaits: walk, trot and bound

Compare the walk, trot and bound gaits of a four-legged robot by leg timing, duty factor, stability and speed, with a worked example.

Nov 12, 2026DuckyHelper

What "computer use" means for AI assistants

Computer use means an assistant that sees a screen, moves a cursor and types, instead of only chatting. Here is the loop it runs and why it is hard.

Nov 12, 2026DuckyHelper

AI on your computer

What a database is and how a query works

Learn tables, rows, columns and primary keys, then trace a SQL SELECT with a WHERE clause on a small students table.

Nov 12, 2026DuckyHelper

Computer science

What a derivative measures

See the derivative as an instantaneous rate of change: speed from a table of positions, shrinking intervals and the slope of the tangent line.

Nov 12, 2026DuckyHelper

What a function really is

A function is a rule that gives exactly one output for each input. Use f(x) = 2x + 1 to learn notation, domain and range.

Nov 12, 2026DuckyHelper

What an algorithm is, explained with sorting cards

An algorithm is a precise list of steps. Sort five playing cards by insertion, trace it in Python, and learn what makes an algorithm correct.

Nov 12, 2026DuckyHelper

Computer science

What an assistant actually sees: a screenshot, not your files

An assistant that helps on your screen sees a picture of it, not your hard drive. Learn the difference between screen capture and file access.

Nov 12, 2026DuckyHelper

AI on your computer

What an assistant should remember about you, and what it shouldn't

What is useful for an assistant to remember about you, like your course and level, what it should not keep, and how you stay in control.

Nov 12, 2026DuckyHelper

AI on your computer

What an integral adds up

See the integral as an add-up of tiny pieces: distance from a speed-time graph, Riemann sums of rectangles, units and signed area.

Nov 12, 2026DuckyHelper

What speeds up a chemical reaction

Collision theory explains why heat, concentration, surface area and catalysts change reaction rates, shown with a tablet in warm and cold water.

Nov 12, 2026DuckyHelper

What teachers should know about screen-aware assistants

A teacher's guide to assistants that can see a student's screen: how they work, a sample class policy, disclosure, and good uses.

Nov 12, 2026DuckyHelper

AI on your computer

What the Industrial Revolution changed

See what the Industrial Revolution changed in technology, work and cities, and what stayed the same, through a textile town before and after factories.

Nov 12, 2026DuckyHelper

What to close before asking for help with your screen

A short habit for sharing your screen with an assistant: which tabs, messages and notifications to close first, shown with a bank tab and a homework tab.

Nov 12, 2026DuckyHelper

AI on your computer

What voltage actually is

Voltage is energy per charge between two points. See the water pressure analogy, where it breaks, and how to measure voltage with a multimeter safely.

Nov 12, 2026DuckyHelper

Wheel encoders: how a robot counts its own distance

Turn encoder ticks into distance and turning for a wheeled robot, with a 360-tick wheel example, and see where slip adds error.

Nov 12, 2026DuckyHelper

When an assistant should speak up and when it should stay quiet

An assistant that interrupts costs you focus; one that never speaks can miss real help. See how asking first and no background watching fit together.

Nov 12, 2026DuckyHelper

AI on your computer

When an explanation is too fast, and how to slow it down

What to do when an explanation moves too fast: ask for one step at a time, check each step, and say it back. Shown on a short algebra problem.

Nov 12, 2026DuckyHelper

AI on your computer

When there is no web page to work with: falling back to the screen

Not every app has a web page. See how an assistant works in a desktop app by looking at the screen and using its own cursor, and what that costs in speed.

Nov 12, 2026DuckyHelper

AI on your computer

Which tasks to hand to an agent and which to keep

Learn a simple rule for deciding which computer tasks an AI agent can take on and which you should keep, with ten everyday tasks sorted by risk.

Nov 12, 2026DuckyHelper

AI on your computer

Why a drone hovers: thrust equals weight

A drone hovers when total thrust equals weight, F = mg. Work out thrust, margin, climb acceleration and tilt for a 1.2 kg drone.

Nov 12, 2026DuckyHelper

Why a web page can try to give an AI agent orders

How hidden text on a web page can try to steer an AI agent, in plain words, and why asking first and treating page text as data keeps you safe.

Nov 12, 2026DuckyHelper

AI on your computer

Why agents get stuck on websites: pop-ups, banners and changing layouts

Why AI agents stall on cookie banners, pop-ups and redesigned pages, how retries work, and why a good one hands the task back instead of guessing.

Nov 12, 2026DuckyHelper

AI on your computer

Why AI sometimes states wrong things confidently

Why a language-based AI can invent a citation and sound sure about it, how text generation works in plain words, and how to protect yourself.

Nov 12, 2026DuckyHelper

AI on your computer

Why an agent hands control back to you

Why a good AI agent stops at CAPTCHAs, sign-ins and approvals and hands the task back, with a worked example and what you should expect to do.

Nov 12, 2026DuckyHelper

AI on your computer

Why an agent should keep a record of what it did

Why an AI agent should leave a plain-English record of its steps, shown by reviewing a finished task, and how the record helps you catch mistakes.

Nov 12, 2026DuckyHelper

AI on your computer

Why an agent should work beside you, not take over your computer

An agent that takes over your mouse makes you wait and guess. Working beside you keeps your cursor yours, with no surprise clicks and visible progress.

Nov 12, 2026DuckyHelper

AI on your computer

Why an AI agent should ask before it sends or pays

Some actions cannot be undone. See why an agent should show you a draft and wait for your OK before it sends a message or pays for anything.

Nov 12, 2026DuckyHelper

AI on your computer

Why an assistant should answer out loud while you keep working

Switching windows to get help costs more than the seconds it takes. See why a spoken answer next to your work keeps you in the task.

Nov 12, 2026DuckyHelper

AI on your computer

Why an assistant should never type your passwords or card numbers

Why an AI assistant should hand you the keyboard for passwords and card numbers, with a login page walked through step by step.

Nov 12, 2026DuckyHelper

AI on your computer

Why diagrams help explanations

Why a quick sketch makes an explanation easier to follow than words alone, shown by explaining a lever with and without a drawing.

Nov 12, 2026DuckyHelper

AI on your computer

Why everything falls at the same rate

Mass cancels in F = ma for gravity, so a hammer and a feather fall together without air. Work out the fall times on Earth and on the Moon.

Nov 12, 2026DuckyHelper

Why fast replies matter for voice assistants

Why a pause before a voice assistant answers feels so long, how latency and streaming speech work, and why speed shapes whether you use it.

Nov 12, 2026DuckyHelper

AI on your computer

Why gyroscopes drift and robots can't trust them alone

See why a tiny gyroscope bias grows into a large angle error, then fix it by fusing the gyroscope with an accelerometer.

Nov 12, 2026DuckyHelper

Why humanoid robots find hands and balance hard

Follow a standing humanoid reaching for a cup: how the center of mass stays over the feet, why contact and many joints make hands difficult.

Nov 12, 2026DuckyHelper

Why most AI assistants need an internet connection

Where an assistant's thinking actually happens, why that usually means a network trip, and what still works offline.

Nov 12, 2026DuckyHelper

AI on your computer

Why one key is better than a menu for asking

Why a single key beats a menu for asking an assistant mid-task: fewer clicks, muscle memory, and no leaving the app you are working in.

Nov 12, 2026DuckyHelper

AI on your computer

Why roboticists test in a simulator first

Why robot code is tried in a simulator before hardware: faster and safer testing, how physics engines work, and what the reality gap leaves out.

Nov 12, 2026DuckyHelper

Why zooming in helps an assistant read small text

Small text in a screenshot is only a few pixels tall. See why zooming in gives an assistant more to read, with the numbers for a scanned PDF.

Nov 12, 2026DuckyHelper

AI on your computer

Wire and program a servo with a microcontroller

Wire a hobby servo to a microcontroller, power it properly, and sweep it from 0° to 180° with a few lines of code.

Nov 12, 2026DuckyHelper

Work, energy and power

Learn what work, energy and power mean in physics by computing the 29.4 J needed to lift a 2 kg book 1.5 m, plus the power for a given time.

Nov 12, 2026DuckyHelper

Working a problem out step by step on a blackboard

Why a problem written out one step at a time is easier to learn from, shown with 1,092 ÷ 12 as long division, plus how to check each step.

Nov 12, 2026DuckyHelper

AI on your computer

Workspace: where a robot arm can reach

Find the reachable region of a two-link arm as a ring between L1 − L2 and L1 + L2, then see how joint limits and obstacles shrink it.

Nov 12, 2026DuckyHelper

Write your first ROS 2 node in Python

Write a ROS 2 node in Python that publishes a counter, build it in a workspace, run it and watch the topic from a second terminal.

Nov 12, 2026DuckyHelper

Writing a first outreach email

Write a short first email to a stranger: a relevant reason, one clear ask, and no hype, with a full worked example and a checklist.

Nov 12, 2026DuckyHelper

Getting work done

Writing a follow-up email that gets a reply

Write a follow-up that gets answered: short subject, one line of context, one clear ask, a deadline, and a worked example after a week of silence.

Nov 12, 2026DuckyHelper

Getting work done

Writing a help center article customers can follow

How to write a help center article a customer can follow alone: one task, numbered steps, screenshots and a test, with a password reset example.

Nov 12, 2026DuckyHelper

Getting work done

Writing a history essay with evidence

Write a history essay with an argument, specific evidence and analysis, using the effects of the printing press as the worked example.

Nov 12, 2026DuckyHelper

Writing a job post that attracts the right people

Write a job post that describes outcomes, separates must-haves from nice-to-haves and says plainly what the role offers, with a full example.

Nov 12, 2026DuckyHelper

Getting work done

Writing a lab report

A clear structure for a lab report, shown on a reaction-rate experiment: title, aim, method, results and discussion, with units and tables.

Nov 12, 2026DuckyHelper

Writing a one-page project brief

Write a one-page project brief covering problem, goal, scope, timeline and owners, so a team starts with the same picture. Worked website refresh example.

Nov 12, 2026DuckyHelper

Getting work done

Writing a page title and description for search

Write a page title and description that say what the page is, fit in a search result, and differ on every page. Includes a before and after example.

Nov 12, 2026DuckyHelper

Getting work done

Writing a persuasive speech

Build a two-minute persuasive speech with ethos, pathos and logos, plan its structure around your audience, and practise delivery.

Nov 12, 2026DuckyHelper

Writing a standard operating procedure

How to write an SOP someone else can follow: purpose, steps, screenshots, owner and review date, with a worked example for processing orders.

Nov 12, 2026DuckyHelper

Getting work done

Writing a strong conclusion

Rewrite a conclusion that only repeats the introduction so it answers the so-what question and leaves the reader with something new.

Nov 12, 2026DuckyHelper

Writing a summary of an article

Write a faithful summary in your own words: find the main idea, pick key points, keep opinions out, and cut to a target length.

Nov 12, 2026DuckyHelper

Writing a thesis for an AP US History DBQ

Build a thesis that makes a claim and previews a line of reasoning by grouping documents. Shown with three short practice documents.

Nov 12, 2026DuckyHelper

Writing a thesis statement that argues something

Turn a weak, topic-only thesis about school start times into a strong, arguable one that is specific and previews your reasons.

Nov 12, 2026DuckyHelper

Writing a weekly status update people read

Write a short weekly status update with done, next and blocked, plus links, so busy readers get the picture in a minute. Includes a five-line example.

Nov 12, 2026DuckyHelper

Getting work done

Writing candidate rejection emails kindly

Write a rejection email that is prompt, thanks the person for something specific and makes no false promises, with a full example.

Nov 12, 2026DuckyHelper

Getting work done

Writing concise sentences

Cut a 40-word sentence to 20 by removing filler, picking strong verbs and keeping one idea per sentence, with each step shown.

Nov 12, 2026DuckyHelper

Writing product descriptions that answer questions

Write product descriptions that answer buyer questions: turn features into benefits, give clear specs, use plain words. Worked lamp example.

Nov 12, 2026DuckyHelper

Getting work done

Writing release notes users read

Write release notes that say what changed for the person using the product, in plain words, with links, using a small update as the example.

Nov 12, 2026DuckyHelper

Getting work done

Writing support handoff notes between shifts

Write a shift handoff note that the next person can act on without asking you: status, next step and owner for every open ticket.

Nov 12, 2026DuckyHelper

Getting work done

Writing survey questions that don't lead

Rewrite biased survey questions into neutral ones: loaded wording, double-barreled questions, unbalanced scales, with three worked rewrites.

Nov 12, 2026DuckyHelper

Getting work done

Writing your first function

Write a Python function that returns the area of a circle, with parameters, a return value and tests using known inputs.

Nov 12, 2026DuckyHelper

Computer science

Zoom, scaling and dark mode: why assistants must handle them

Why display scaling, browser zoom and dark mode change what a screen-aware assistant sees, and how it keeps its pointing accurate.

Nov 12, 2026DuckyHelper

AI on your computer

Questions and jobs

Do anything

Ask it a question or hand it a job, in any app.

Doing jobs for you is in early access on Mac. Asking works on Mac, Windows and Linux.