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

Obsidian was pretty fun to work with. We received two large obsidian rocks, which we cut into super thin transparent slices ...

A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought. Turns out ...