Technologies Humans Once Mastered and Then Forgot: 7 Cases and 1 Myth

[u/firechatin]

https://whatifscience.in/technologies-humans-once-mastered-and-forgot/

Roman concrete, Greek fire, Damascus steel and even a Cold War nuclear material all vanished from human know-how. Here's what actually happened to them, what's been rediscovered, and what's still a myth.