llmphysics.com

Physics olympiad problem sets rendered in academic HTML, with official solutions, Claude's own solutions, and criterion-by-criterion self-assessments against the grading schemes.

An interactive web simulation of the trick behind the first black hole image: draw your own sky, scatter radio telescopes across a world map, and let the Earth's rotation combine them into a single planet-sized telescope that reconstructs your drawing.

A web simulation of Mark Kac's 1966 question: draw any drum shape, see its vibration spectrum and Chladni-style mode patterns, and hear how it would sound.

A physicist's resolution of the "expanding space stretches photons" picture: accumulated Doppler shifts, parallel transport, and the Bondi decomposition.

The oldest known Estonian-language poem (1708): Käsu Hans's lament for Tartu destroyed in the Great Northern War, side by side with a modern Estonian rendering. In Estonian.

A hands-on electronics series for a young child and a science-fluent parent: build-it-yourself projects with from-first-principles explainers for the grown-up.

Arithmetic drills that get harder only as you get better: start with tiny sums and work up. Progress is saved on the device.

A reading-practice game for a child learning to read Estonian: match words to pictures, pictures to words, or spell words from letter tiles, across six difficulty levels. In Estonian.

A one-page, print-friendly cheat sheet: turns, rent, building, jail, trading and bankruptcy at a glance.