Thousands of stone tools made by early humans around 20,000 years ago have been found in a cave. The "important" find reveals connections between prehistoric people, say scientists. Archaeologists ...

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.

Based on these tools, scientists have made inferences about early humans’ fine motor skills, for example. So, determining whether these stone flakes were made on purpose can change ...