The megalodon went extinct 3.6 million years ago, and is thought to be the largest shark that ever swam the Earth. But the megalodon may not have been as big as once thought, some researchers suggest.

The megalodon went extinct 3.6 million years ago and is thought to be the largest shark that ever swam the Earth — until now. (Story first aired on All Things Considered on January 23m 2023.) ...