> I wonder what was involved in the discovery of stone. Mostly archaic humans hitting rocks against each other until they notice that flint knapping [1] create

> I wonder what was involved in the discovery of stone. Mostly archaic humans hitting rocks against each other until they notice that flint knapping [1] creates a sharp edge. [1] https://en.wikipedia.org/wiki/Knapping https://en.wikipedia.org/wiki/Knapping