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Learn to solve equations step by step: the foundation of all higher mathematics.
Learn how artists use color to create mood, depth, and meaning: from the color wheel to masterworks.
Decode the molecule that builds every living thing: from bacteria to blue whales.
Zoom into the atom & discover why the periodic table serves as the most powerful cheat sheet in science.
Write your first Python programs: print, variables, input, and logic.
Algorithms live everywhere: in how you sort your toys, find your shoes, or figure out the fastest way to eat your vegetables first. This lesson finds algorithms in everyday life, sorts by color & size, & discovers that some ways of searching work faster than others.
Linear search checks every item one by one. Binary search jumps to the middle & cuts the work in half each time. Bubble sort compares neighbors & swaps them. This lesson builds intuition for why organized data lets computers work faster — with hands-on examples using numbers & words.
Big O notation describes how an algorithm's cost grows as the input grows. O(N) means doubling the input doubles the work. O(N²) means doubling the input quadruples the work. This lesson builds Big O intuition through programming examples, comparison tables, & hands-on cost calculations — then points to a deeper dive in our unhamming course.
Big O describes worst-case growth. Theta describes tight bounds. Omega describes best case. Space complexity tracks memory, not just time. Amortized analysis spreads occasional expensive operations across a sequence. This lesson builds the formal toolkit for analyzing any algorithm.
A list stores items in order. A set stores unique items for instant lookup. Choosing between them changes your program from O(N²) to O(N). This lesson builds intuition for when to reach for each data structure, how their Big O costs differ, & how to combine them to solve real problems.
Clean hands, a smart menu, long-handled tools, and food scraps that leave with you. Cook outside without burning yourself or the forest.
Understand the invisible force that sets every price: from sneakers to streaming subscriptions.
Examine evidence for climate change, understand the mechanisms & evaluate what we can do about it.
Pick a safe campsite, read the clouds before the storm hits, spot hypothermia, and dress in layers.
Travel back 5,000 years to banks of the Nile & discover how one river built a civilization.
Find colors and shapes everywhere you look! A first lesson for little learners.
Cardinal directions, compass reading, topo maps, and the wilderness rule for when your tools disagree.
Discover why continents drift, mountains rise, earthquakes shake, and volcanoes erupt: the engine beneath your feet.
Discover a 2,500-year-old formula that connects geometry to the real world: from construction to GPS.
Understand the document that created a government & the amendments that keep it alive 230+ years later.
Scene safe, call for help, stop bleeding, cool a burn, stay with the patient. The five things every kid should know.
Learn about your amazing body! From your head to your toes and everything in between.
Learn what food actually does inside you, & why the best diet works simpler than the internet makes it seem.
Examine key moments that decided the largest conflict in human history, & the world it left behind.
Meet the alphabet! Learn letters & the sounds they make.
Read and analyze Robert Frost's classic poem about choices and their consequences.
Confront the most famous question in literature: and discover why a 400-year-old play still speaks to us.
Count along with us! A first numbers lesson for little learners.
Master fractions through real-world examples: cutting pizza, sharing candy, and building toward algebra.
Calculate areas of 2D shapes, volumes of 3D solids, and plot points on the coordinate plane.
Learn about points, lines, rays, angles, and how to find symmetry in shapes.
Explore congruence, similarity, geometric transformations, and the foundations of trigonometry.
Find circles, squares, triangles, and rectangles in the world around you.
Understand the building blocks of every song ever written: from Bach to Beyonce.
Master the soprano recorder's full range, cross-fingering, articulation, breath, and the creeping accelerando of Grieg's 'In the Hall of the Mountain King'.
High and low, loud and soft, a steady beat, and gentle warm air: a first music lesson for little learners, getting ready to play the recorder.
Master the recorder family, transposition, ensemble reading, Baroque ornamentation, and tuning, then carry that musicianship straight into a concert band woodwind section.
Learn to hold a recorder, blow gentle warm air, and play your first three notes: B, A, and G.
Sharpen your mind with the tools philosophers have used for 2,500 years to find truth and spot nonsense.
Understand the three laws that govern everything from falling apples to orbiting planets.
Learn the fire triangle, build it small to big, pick a safe spot, and never leave a fire half-out.
Blood circle, cut away from your body, why sharp beats dull, and the safe-pass handoff.
Learn two knots that hold the world together. Square knot to join, bowline to loop.
Learn about feelings (happy, sad, mad, scared) & how to become a good friend.
Explore the science of remembering & forgetting, & learn why your brain proves both amazing & unreliable.
Discover animals and their homes! From farms to oceans to jungles.
Discover how cells work: from membranes to mitochondria: and why every living thing depends on them.
Learn which plants are safe and which ones to leave alone. Always ask a grown-up first!
Find Polaris using the Big Dipper, learn why we have seasons, and use the sky as a navigation tool.
Sun, rain, snow, and wind! Learn about weather and the four seasons.
Identify a local need, design a feasible plan, measure honest impact, and reflect on what changed in you as well as in them.
Learn the math behind luck: from coin flips to card games to predicting weather.
Learn to argue like a lawyer and write like a journalist: the art of changing minds with words.
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