Colossal Biosciences claims it has revived an extinct species, but scientists outside the company are skeptical. Andrew Zuckerman/Colossal Biosciences Somewhere in the northern US, drones fly over a 2 ...

I'm sitting in an outdoor pen with four puppies chewing my fingers, biting my hat and hair, peeing all over me in their excitement. At eight weeks old, they are two feet from nose to tail and must ...