Imagine stumbling upon a hidden vault that preserves whispers from a world over half a billion years ago—a time when life on ...

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.

Archaeologists have evidence for long-distance trade routes across North America that could totally rewrite previously ...