(CNN) — Paleobiologist Dr. Kenshu Shimada has been fascinated by fossil sharks, including the giant Otodus megalodon, since childhood — he found his first megalodon tooth at 13 years old. So when he ...

A group of German scientists tested the effects of a more acidic ocean on sharks' teeth and found that future generations of ...

Fifteen million years ago, now-extinct species of dolphins, whales and large sea cows roamed the world’s oceans, topping the underwater food chain. Yet back then, any one of these creatures could ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. If you picture a megalodon, chances are you envision what amounts ...