Since then, beavers have been coming down to the Bronx and that’s a hopeful thing for a lot of people. It shows that we’re capable of remedying some of our most serious environmental mistakes.

The notion of bringing vanished species back to life—some call it de-extinction—has hovered at the boundary between reality and science fiction for more than two decades, ever since novelist ...

The Denisovans, together with the Neanderthals, are the closest extinct relatives of modern humans. It wasn't until 2010 that scientists announced that the Denisovans existed, so much about them ...