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 saw the ...

While movie megalodon is heightened for entertainment, the real thing was still huge. Megalodon was a white or mackerel shark, related to today’s great white shark. Some believe the whale shark is ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The prehistoric ...

Editor's Note: The video above is from 2018. When did the megalodon shark go extinct, and why? That's the question posed by 10-year-old Landon. Imagine traveling back in time and observing the oceans ...

A more reliable way of estimating the size of megalodon shows the extinct shark may have been bigger than previously thought, measuring up to 65 feet, nearly the length of two school buses. A more ...