DuckyHelper
Guides and notes from the team that builds DuckyHelper, at MingLLM.
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.
When DuckyHelper looks at your screen, and when it doesn't
DuckyHelper sees your screen only while the pill is open and for that answer. How that works, why we built it that way, and what it never does.
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.
A 90-day plan to learn a language as an adult
A three-phase, 90-day plan for adult language learners: build the habit, take in lots of input, then start speaking, with daily minutes you can total up.
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.
A four-week SAT math plan built from a diagnostic
Take one full math diagnostic, sort your misses by topic, and turn them into four weekly focus areas with timed practice built in.
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.
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.
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.
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.
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.
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.
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.
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.
A small pill, not a chat window
Why DuckyHelper lives in a small pill on your screen instead of a big chat window, and how the pill shows listening, thinking and talking.
A spaced repetition plan for a test three weeks away
Turn 60 flashcards and 21 days into a day-by-day review schedule that spaces practice out, so you remember more on test day with no cramming.
A study routine that survives a busy season
Build a study routine with short daily slots and a weekend catch-up for weeks packed with games, rehearsals or other commitments.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Bring the worksheet, not a description of it
Retyping a worksheet loses details. Showing DuckyHelper the actual page lets it see your work and help with what is really there.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Building a learning habit with 20 minutes a day
Build a daily study habit around 20 minutes: pick one time, set a small goal, split the session into parts and track it, with a routine to copy.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Choosing your first robotics project
How to pick a first robotics project you will finish: judge scope and skills needed, and compare three ideas with a simple weighted score.
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.
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.
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.
Clean up a messy spreadsheet before you analyze it
A step-by-step cleanup for exported sheets: stray spaces, mixed capitals, dates stored as text and duplicates, with formulas for Excel and Google Sheets.
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.
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.
Click by click vs one call
Why calling a site's own actions beats imitating a person's clicks, explained with an illustration and not a benchmark, plus where clicking still wins.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Computer use
Computer use is when an AI looks at a screen and operates it like a person would, by moving a cursor, clicking and typing.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Diagrams drawn, not pasted
Why DuckyHelper draws its diagrams as it explains instead of showing photos, and how the blackboard builds a picture one label at a time.
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.
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.
Doing what you asked, then a short why
A rule we want DuckyHelper to follow: answer what you asked before teaching. A quiz means a quiz, and a short why comes at the end.
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.
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.
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.
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.
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.
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.
DuckyHelper on Mac, Windows and Linux
The same assistant on three systems, the one key to press on each, and what your computer asks you to allow the first time.
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.
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.
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.
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.
Electronics basics before your first robot
Voltage, current, Ohm's law, breadboards and safe power for beginners, with a worked calculation for the resistor that protects an LED.
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.
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.
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.
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.
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.
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.
Exit tickets that show who is lost
A teacher's guide to three-question exit tickets that sort a class in minutes, with a full fraction-addition example and a plan for tomorrow's lesson.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Finishing an online course you started
How to restart a stalled online course and finish it in a month: count what is left, skip what you know, schedule sessions and add accountability.
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.
Fixing careless mistakes before test day
Keep an error log, sort your slips into categories, and add one small check for each so careless mistakes stop costing you points.
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.
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.
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.
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.
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.
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.
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.
Free study guides with worked examples
What is in DuckyHelper's free study guides, why they start from worked examples, and how to use one alongside the app.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Getting started with pivot tables
Learn pivot tables with a small sales sheet: what rows, columns, values and filters do, how to build a monthly summary, and how to check the totals.
Getting through AP exam season with three exams
A three-week plan for studying for three AP exams at once: stagger your focus, use mixed review, and practice under time without burning out.
Getting through your first problem set
A week-long plan for a calculus problem set: start early, attempt every problem, and bring specific questions to office hours.
Getting unstuck on homework without copying the answer
A four-move routine for when a homework problem will not budge: reread, find the step, try a simpler case, then ask a specific question.
Giving feedback students act on
How to write feedback that students use: name one thing that worked, give specific next steps and leave class time to revise, shown on a lab report.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Helping a teenager plan for exams without nagging
A planning conversation for parents: let your teenager own the exam plan, agree on short check-ins, and offer support without hovering.
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.
Helping with math homework you don't remember
You do not need to remember the math to help. Ask your child to explain, learn alongside them, and use worked examples, with fractions as the example.
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.
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.
Homeostasis and feedback loops
See how negative feedback keeps body temperature steady, with sensors, a control centre and effectors, and where positive feedback fits.
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.
House rules for kids using AI homework helpers
A family agreement for AI homework help: hints first, explain it back, time limits and parents decide, with a sample you can adapt.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
How DuckyHelper learns a website once and reuses it
When DuckyHelper works on a website it can write small JavaScript tools for it, turn its buttons into actions on the fly and reuse them next time.
How DuckyHelper pricing works: credits are minutes of talking
Plus, Max and Unlimited in plain words: what credits mean, how yearly billing works and what the first three months cost, from our published pricing.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
How the 10-minute try works
You can try DuckyHelper for 10 minutes with no card. What is worth doing in that time and where to look afterward.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Human in the loop
Human in the loop means a person stays part of an automated process and approves certain steps before they happen.
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.
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.
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.
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.
IMU
An IMU, or inertial measurement unit, is a small sensor that measures acceleration and rotation to track how something moves and which way it faces.
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.
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.
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.
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.
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.
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.
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.
Inverse kinematics
Inverse kinematics finds the joint angles that put a robot's hand, foot or tool at a chosen position, the reverse of forward kinematics.
Ionic and covalent bonds
Compare sodium chloride (electron transfer) and water (electron sharing), use electronegativity differences, and link bond type to properties.
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.
Joining a robotics team: what to expect
What a first season on a robotics team looks like: roles, meetings, competitions and learning from mentors, with a sample season and a time budget.
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.
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.
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.
Learning a new software tool at work in a week
A five-day plan for getting useful in a new work tool: find the three tasks you need, use a practice file, learn a few shortcuts and write your own notes.
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.
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.
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.
Learning Python in eight weeks
An eight-week plan for adults teaching themselves Python: one small project a week, how to read error messages, and what to do when you get stuck.
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.
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.
Learning to code for robots: a six-week path
A six-week path from blinking an LED to reading a sensor, one concept per week, with code, a sensor-reading calculation and tips for debugging.
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.
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.
Limiting reagents
Find which reactant runs out first and how much product forms, using hydrogen and oxygen making water, plus a sandwich analogy.
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.
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.
Lists, dictionaries and sets
Compare Python lists, dictionaries and sets by counting the words in a sentence, and learn when to use each one.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Making a worked example sheet
How to build a worked example sheet that shows every step, fades the steps out gradually and ends in practice pairs, with a full equation-solving sheet.
Making office hours worth the walk
Prepare three questions before office hours: show your attempt, point to a specific step, and follow up afterwards. Includes a worked physics question.
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.
Mapping a semester from the syllabus
Turn four course syllabi into one calendar: all deadlines in one place, plus a weekly load check that shows where the crunch weeks are.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Momentum and collisions
Understand momentum and its conservation by solving two carts that stick together, then compare with an elastic collision and check energy.
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.
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.
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.
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.
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.
Note-taking for students who hate taking notes
A minimum note template for one class: three questions, one diagram and one summary line, for students who find note-taking a chore.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Osmosis and the cell membrane
Learn osmosis, hypertonic, hypotonic and isotonic solutions, and work out the isotonic point from potato slice mass data.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
PID controller
A PID controller is a feedback rule that adjusts an output using the present error, the accumulated past error and the rate the error is changing.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Preparing for a quiz in 30 minutes a day
A five-day, 30-minute-a-day plan for a Friday quiz that uses recall first, mixed practice and checking with answers.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Quizzes when you want them, not when we decide
Why practice in DuckyHelper is something you ask for: a quick check when you want one, and retrieval practice explained in plain words.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Reading research papers for a class
Read a research paper in three passes: abstract and figures first, then methods, then critique notes. Includes a time budget and note template.
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.
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.
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.
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.
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.
Recursion explained with factorials
Understand recursion through 5! = 120: the base case, the recursive case and how the call stack builds up and unwinds.
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.
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.
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.
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.
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.
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.
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.
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.
Retrieval practice
Retrieval practice is studying by trying to recall something from memory, instead of rereading it, which strengthens what you remember.
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.
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.
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.
Revising a draft in three passes
Revise in three passes, from structure to paragraphs to sentences, and watch one paragraph improve at each step.
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.
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.
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.
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.
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.
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.
Running jobs on a schedule
How always-on automations work in DuckyHelper: pick a site, say what you want, and it keeps doing it, with a few things that still wait for you.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Setting up a homework space and routine
Set up a homework space and a simple routine with the same time and place, short breaks and phones away, shown with a plan for a ten-year-old.
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.
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.
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.
Showing the work as plain steps
Why DuckyHelper shows what it is doing as short, plain-English steps instead of raw tool names, and what a finished job looks like.
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.
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.
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.
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.
SLAM
SLAM, simultaneous localization and mapping, is how a robot builds a map of a place while working out where it is inside that map.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Spaced repetition
Spaced repetition is reviewing something at gradually longer gaps, just as you are about to forget it, so that it stays in memory.
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.
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.
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.
SQL for spreadsheet users
Learn SQL by mapping it to what you already do in a spreadsheet: SELECT for columns, WHERE for filters, GROUP BY for SUMIF and pivot tables.
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.
Starting a robotics club for beginners
A practical guide to starting a beginner robotics club: kits, roles, safety rules, small wins and a full eight-week plan you can copy and adapt.
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.
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.
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.
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.
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.
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.
Studying for a cumulative college final
A two-week plan for a cumulative final: map the big ideas, work old exams, and use spaced mixed review across the whole course.
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.
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.
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.
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.
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.
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.
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.
Taking a full practice test at home properly
How to run a full practice test at home so it tells you the truth: real timing, scheduled breaks, no phone and a review afterward.
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.
Teaching one step at a time
How we want DuckyHelper to pace an explanation, especially in math: one step, the reason for it, then a check before moving on.
Teaching yourself calculus
A 10-week self-study plan for single-variable calculus: check the prerequisites, one topic a week and problems over videos, with a checked example.
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.
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.
The carbon cycle
Follow one carbon atom through photosynthesis, respiration, decay, the ocean and fossil fuels to understand stores, flows and the carbon cycle.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Types of genetic mutations
Compare silent, missense, nonsense and frameshift mutations by editing one short mRNA and translating each version.
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.
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.
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.
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.
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.
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.
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.
Using evidence: quote, paraphrase, explain
Learn to introduce, cite and explain evidence, using a short passage from Frederick Douglass as a worked example.
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.
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.
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.
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.
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.
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.
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.
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.
Viruses and bacteria compared
Compare viruses and bacteria by size, structure and reproduction, and see why antibiotics work on bacteria but not on viruses.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
What to ask a teacher at a parent conference
Five questions that turn a short parent conference into a plan: your child's strengths, gaps, how to help at home and what to do next.
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.
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.
What we mean by "only when you ask"
Opening a pill with a key is why DuckyHelper does not listen or watch when idle. What the key does, what idle means and how you can tell it is listening.
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.
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.
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.
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.
When there is no website: working with its own cursor
Not every app has a web page behind it. How DuckyHelper sees and uses the screen with a cursor of its own when there is nothing to call.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Why DuckyHelper draws on your screen instead of describing it
Pointing beats describing. How DuckyHelper draws circles, arrows and short notes right on your screen, and why we built it that way.
Why DuckyHelper is built not to type your passwords or card numbers
A rule we do not plan to bend: DuckyHelper is built not to type your passwords or card numbers. What happens at a sign-in page and why.
Why DuckyHelper is built to ask before it sends a message or pays
Sending a message and paying are the two things DuckyHelper is built to check with you first. Here is what that means and why we drew the line there.
Why DuckyHelper talks instead of making you type
Why the main way to use DuckyHelper is your voice: one key in any app, an answer out loud, and no tabs to switch while you keep working.
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.
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.
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.
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.
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.
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.
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.
Why we built a blackboard into DuckyHelper
Some ideas need to be worked out, not pointed at. Why DuckyHelper can open a blackboard and work through a problem with you, one step at a time.
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.
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.
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.
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.
Working beside you: its own cursor in its own window
Why DuckyHelper works in the window you give it, with a cursor of its own, while you keep working. The ring turns green when it is done.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Writing a persuasive speech
Build a two-minute persuasive speech with ethos, pathos and logos, plan its structure around your audience, and practise delivery.
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.
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.
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.
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.
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.
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.
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.
Writing clear work emails
Learn to write work emails people answer: lead with the ask, give just enough context, name the next step. Includes a long email rewritten in five lines.
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.
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.
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.
Writing retrieval practice questions for your class
Write ten low-stakes retrieval questions for a unit that ask students to recall, not recognize, and bring them back on a spaced schedule.
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.
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.
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.
Your first robot in a weekend
Build a two-motor robot that drives and turns in a weekend: the part types, the wiring, a first program, a wheel-distance check and the safety basics.
Your first week with a new subject: a plan that sticks
A simple first-week plan for any new subject, worked out for starting chemistry: vocabulary first, one example a day and a Friday self-quiz.
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.
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.