And in the controversial battle to bring the woolly mammoth back from extinction, scientists have just taken one mouse-sized step forward. Colossal Biosciences has revealed the world's first ...

Kluger is an editor at large at TIME. A woolly mouse compared with a normal mouse, at Colossal Biosciences labs. A woolly mouse compared with a normal mouse, at Colossal Biosciences labs.Courtesy ...