A small, growing shelf of single-page explainers — each one turns something intimidating into a thing you can poke, drag, and feel until it clicks.
Each one is a single page — no sign-up, no setup. Open it, start playing, and walk away understanding something you didn't an hour ago.
Roll a wheel one full turn and it travels π — about 3 and a bit. Then chase the number people have hunted for 4,000 years, from Archimedes' polygons to a sum that never ends.
Roll the wheel →Hundreds of tiny city-states that argued, sailed, and invented half the modern world. Drag a marble marker across 2,000 years and watch the scene morph from bull-leaping Minoans to Alexander the Great. Meet the twelve gods of Olympus, vote in the very first democracy, build a temple column by column, and carve your own name in Greek.
Sail into the past →A test that's 99% accurate says you have a rare disease — so you're 99% doomed, right? Not even close. Drag two dials across 1,000 little people and watch a wall of false alarms swamp the handful of real cases, until a scary positive turns out to be a gentle nudge, not a verdict.
Run the test →Zero is home base — step right into the light, left into the shadow realm. Drag a chibi hero along the line, hop through plus and minus, zoom into the fractions hiding between whole numbers, then survive a boss-battle quiz. The same humble ruler secretly runs temperature, money, game HP, and maps.
Start the quest →Every people, in every corner of the world, has asked the same big questions. Tap a glowing land to meet its beliefs, then drag the hand of time from the first cave-painters to today.
Tour the world of belief →Sunlight zooms in like it owns the place — but the heat it leaves behind can barely get out. Tap the sky, add greenhouse gas, and watch Earth's one-way door trap the warmth.
Open the sky →No equations — just a hiker lost in the fog, feeling for the way downhill. That one stubborn little habit is the engine humming under almost all of modern AI. Roll balls down a hill, dial the step size, and watch a line teach itself to fit.
Take the descent →Can't solve it? Roll the dice — ten thousand times. Monte Carlo turns terrifying problems into a humble loop with a counter: scatter random darts to pin down π, simulate the unsimulatable, and watch raw chance converge on a startlingly exact answer.
Place your bets →