cooking

That golden crust on bread and the sear on a steak come from the same chemistry: hundreds of simultaneous reactions producing a huge range of flavor molecules.

Fire transformed humanity. It allowed cooking — which expanded our diet, shrank our guts, and grew our brains. It enabled metallurgy, ceramics, glass, and ultimately civilization itself. Without it, our species would be smaller, weaker, less intelligent, and forever stuck in the Stone Age.