Add Yahoo as a preferred source to see more of our stories on Google. Our prehistoric human ancestors relied on deliberately modified and sharpened stone tools as early as 3.3 million years ago. The ...

The very first humans millions of years ago may have been inventors, according to a discovery in northwest Kenya. Researchers have found that the primitive humans who lived 2.75 million years ago at ...

WASHINGTON (AP) — Early human ancestors during the Old Stone Age were more picky about the rocks they used for making tools than previously known, according to research published Friday. Not only did ...

A new study reveals early humans deliberately quarried stone for tools 220,000 years ago, showing advanced planning far earlier than believed.

Our prehistoric human ancestors relied on deliberately modified and sharpened stone tools as early as 3.3 million years ago. The selection of rock type depended on how easily the material could be ...