Learn by watching
Every topic has three layers: the intuition in plain words, the mathematics, and how the engine does it, with its validation. Live simulations run beside the text, and every one opens in the playground with sliders, a free-body diagram and graphs.
Trust the numbers
Every solver is tested against closed-form solutions and tracks its own conserved quantities. Errors and drift are published, not hidden.
One engine, three doors
The same Rust core powers the Python package, the browser playground and these docs. No toy version.
Scenes are data
Export any scenario as JSON, edit it, load it back in the playground, or run it in a notebook with NumPy arrays out.
