Intel's revolutionary 54-year-old 4004 chip was the world's first programmable microchip — 2,300-transistor 10,000nm processor exposed

https://www.tomshardware.com/pc-components/cpus/cpu-collector-exposes-microscopic-insides-of-intels-revolutionary-4004-chip-10-000nm-chip-was-the-worlds-first-programmable-microchip-processor