A rendering of Clavusodens mcginnisi, or “McGinnis’ nail tooth,” an ancient shark that stalked the ocean floor 340 million years ago. Rendering courtesy of the National Park Service A shark ...

Fossils and shark teeth in every shovel full ... It's been 50 years since the first TV theme song topped the Billboard chart. See what it was—and more TV shows that made history.

there’s something about Megalodon that grips the imagination like no other. Fossilized shark teeth are some of the most abundant remnants of prehistoric oceans, providing scientists with crucial ...