With a little guidance and a lot of practice, even you can make stone tools the way our oldest ancestors did — and learn to ...

It heats the stone to around ... by digging with a drill bit—the kind used to bore oil wells—down to around 1 or 2 miles.

But as an experimental archaeologist with over a decade of experience studying and manufacturing stone tools, I can say that there are telltale signs that a rock has been modified by humans or our ...