An interactive Newton's cradle with a real Hertzian contact law, the force pulse travelling through the chain, and an exact map of every outcome that conservation of momentum and energy actually permits. Runs entirely in the browser: free, no account, no model. Newton's cradle is a public domain device; this is an independent reimplementation. The physics follows Hutzler, Delaney, Weaire & MacLeod, Am. J. Phys. 72, 1508 (2004), with Hinch & Saint-Jean (1999), Hermann & Seitz (1982) and Nesterenko (2001).

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