This surprising mammal fossil is giving scientists something to chew on

It's likely you've already chewed and swallowed some tasty morsel today. But when did that ability emerge? New evidence points to at least the middle Jurassic, back when dinosaurs still reigned.

It's likely you've already chewed and swallowed some tasty morsel today. But when did that ability emerge? New evidence points to at least the middle Jurassic, back when dinosaurs still reigned.