Before hominins intentionally chipped stone to make tools, they likely used sharp rocks already shaped by natural forces.

Sharp stone technology chipped over three million years allowed early humans to exploit animal and plant food resources. But how did the production of stone tools -- called 'knapping' -- start?

The new hypothesis proposes that for a substantial amount of time before early humans made their own stone tools they first used and relied on naturally sharp rocks produced via natural geological ...

The new hypothesis proposes that for a substantial amount of time, before early humans made their own stone tools, they first used and relied on naturally sharp rocks produced via natural ...