Our planet is several billion years old—a number so vast it’s almost impossible to truly comprehend. In all that time, ...

Skeleton season may be just around the corner, but the skeleton age dawned with the early Cambrian Period, about 538 million to 506 million years ago. In this time span, most major animal groups ...

Newfound fossils from China suggest that complex animals were around millions of years earlier than thought, among them ...