The mysterious Greenland shark has an unusually long lifespan, and scientists are beginning to think they finally know why.

But not all paleontologists agree ... By comparing them to the body plans of 170 other shark species, both living and extinct, they then were able to estimate how large that particular megalodon ...

All over the world, their meat is being consumed. Every year, about 100 million sharks are hunted and killed. There are about 536 known species of shark in the world, and 316 of them are ...