In a blow to anyone dreaming that complex life may exist elsewhere in the universe, a new study suggests we're unlikely to ...

Life on Earth. Where did it come from? How long has it existed here? While we're still searching for the answers to one of those questions, scientists think they might have discovered the answer to ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Most scientists agree that complex life likely formed during the Ediacaran Period some 600 million years ...