Jeff Bezos and Elon Musk are clashing again, this time over a turtle. While both billionaires have long competed in space travel, Musk has been stealing the spotlight in recent days with plans to ...

Sometime between 5.5 and 5.6 million years ago, two shell crushers squared off in the languid currents of an ancient Florida river. The fossils they left behind, discovered by paleontologists at the ...