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 ...

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 ...

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 ...

Niguss Gitaw Baraki receives funding from the Leakey Foundation and the U.S. National Science Foundation. Dan V. Palcu Rolier's work was supported by NWO Veni grant 212.136, FAPESP grants 2018/20733-6 ...