Science you can see.
Interactive models of the ideas that shape physics. Each one is built on the real equations, explained in plain language first, with the maths one tap away.
Curved spacetime
Why clocks run slow near a black hole, how light bends and is captured, and what falling in really means.
OpenSpecial relativity
Moving clocks, shrinking rulers, and why two observers can disagree about “now” and both be right.
OpenLight as a wave
Electric and magnetic fields chasing each other through space, from an antenna to a rainbow.
OpenRays and lenses
Light slowing down in glass, bending by Snell’s law, trapped in a fibre, focused by a lens and split by a prism.
OpenQuantum waves
The double slit, tunnelling through walls, and the shapes of the hydrogen atom’s orbitals.
OpenEntropy and time’s arrow
Watch order dissolve in a gas of colliding particles, and see why it never runs backwards.
OpenReal equations
Every motion on screen comes from the actual physics, with automated tests against known results.
Plain language first
A short guided tour explains what to look for. The maths is there for anyone who wants it.
Honest pictures
Each model says what is calculated and what is only drawn for clarity, such as colours, glows and sizes.