Stone to Silicon

Math & science · 1900

Planck's quantum

Planck assumes energy comes in discrete packets to explain glowing hot objects.

E = h times frequency fitted blackbody spectra perfectly. Planck saw it as a trick; within 25 years it became quantum mechanics.

See it in the living treeWikipedia

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 2

What it led to 3