Sharks grew and dominated the seas once again. Megalodon, the biggest shark of all, was nearly 50 feet (15 meters) long. Meanwhile on land, Asian and African apes diverged and then, several ...

Consider the chilling possibility that the massive Megalodon shark is still alive and lurking in the deepest parts of the ocean.

This story appears in the March 2011 issue of National Geographic magazine. It's not every day that a living fossil shows up in a fisherman's net. But that's what happened in 1938, when a South ...