This wasn’t always a mystery. If you had the misfortune of being a human being more than 10,000 years ago, there’s a decent chance you were intimately aware of what a saber-tooth cat sounded like.

(CNN) — Woolly mammoths, giant sloths and saber-toothed cats were a fact of life for early humans. But today’s researchers can only hope to find fossils that will shed more light on the existence of ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. The cataclysmic climate changes that ended our last Ice Age wiped ...

Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. Woolly mammoths, giant sloths and saber-toothed cats were a ...