Sandbox
Break the equation. See what moves.
9 live experiments. Each one runs the real equation in your browser: drag things, build things, change every number, then share your setup with a link.
Free mode
A blank graph. Type any equation and see it at once: graphs, shapes, curves and systems that change over time.
Swings and wobbles
Things that go back and forth, and why some settle down while others go wild.
Machines
Trade force for distance. Build your own and see what you gain, and what you pay.
Heat
How heat creeps from hot to cold, and why metal feels colder than wood.
Space
Gravity, falling and missing.