When monkeys in Thailand use stones as hammers and anvils to help them crack open nuts, they often accidentally create sharp flakes of rock that look like the stone cutting tools made by early humans.

A long-tailed macaque uses a stone to get at food. The striking of one stone on another accidentally creates stone flakes the monkeys don't use. Lydia V. Luncz When monkeys use two rocks to smash open ...

Every archaeologist who has ever worked at Fort McCoy has encountered a specific type of artifact: the flake. Flakes, referred to as debitage in archaeological jargon, are pieces of stone waste left ...