Last year, hiking in Morocco’s eastern Atlas Mountains, I found an ammonite, a fossil of those spiral-shape cephalopods that to many symbolize paleontology itself. The fossilization process had turned ...

Dire wolves are back—sort of. Dire wolves are back—sort of. Colossal Biosciences claims to have resurrected this extinct predator, but what did they really do? Joe talks with the scientists behind the ...