Interactive labs
Real models you can predict, push and break.
Every lab here was built by our engine and run before you saw it. Each one runs the actual mathematics or algorithm, composed from simple building blocks and checked so the surprise is real and the challenge is solvable.
Maths
Calculus, probability, linear algebra and proof, felt before they are formal.
Should you switch doors?
You pick Door 1. The host opens another door to show a goat. Two doors are left. Are they really fifty-fifty?
What a matrix actually does
Drag two arrows and the whole picture follows: stretched, sheared, turned or flipped. That’s all a matrix is.
A positive test isn’t a 99% chance
An accurate test says positive. How worried should you be?
Computer science
Algorithms and systems you can step through, break and fix.
AI
Optimisation, attention and learning machines, from the inside.
Why ChatGPT changes its next word
Finish “The cat sat on the ___.” If ChatGPT finished it twenty times, would it choose the same word every time?
Why a bigger step can make learning slower
Turn up the learning rate and watch training fall apart.
How attention turns scores into focus
Drag a query vector and watch a transformer decide where to look.
Physics
Forces, fields, waves and flows you can push on.
Remove a resistor, and the reading goes up?
A meter reads 232 Ω across a resistor network. Disconnect one resistor. Will the reading rise, fall or stay the same?
Two carts, one spring that sometimes sleeps
Two carts on springs, joined by a third. Move them together and the middle spring never stretches. Pull them apart and everything changes.
Same throw, opposite spin, different break
Two pitches leave from the same height with opposite spins. One crosses the plate higher, though gravity pulls on both the same.
Why Earth speeds up near the Sun
In January, Earth is about 5 million km closer to the Sun than in July. Does it move at the same speed?
Why channel flow is fastest in the middle
Push water through a channel and see the speed profile bend.
Want a lab about something else?
Ask any question and Feynman School builds a whole quest of them, just for you.
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