Geography

South Pole Editorial. Two men led the first expeditions to our planet’s southernmost point in 1912. But only one of those men made it back alive.

Somehow, in the middle of the Dark Ages, it was one of the most accurate maps in the world. But how did Fra Mauro accomplish it?

South Pole Editorial. Two men led the first expeditions to our planet’s southernmost point in 1912. But only one of those men made it back alive.

Why is the ocean salty? It actually wasn’t always salty—but a few billion years and some basic chemistry made it that way. So how did it happen?