Researchers have long debated what happened when the indigenous Neanderthals of Europe met "modern humans" arriving from Africa starting some 40,000 years ago. The end result was the disappearance of the Neanderthals, but what happened during the roughly 10,000 years that the two human species shared a land?
A new review of the fossil record from that period has come up with a provocative conclusion: The two groups saw each other as kindred spirits and, when conditions were right, they mated.
PLUS, take the quiz! Are you smarter than a 5th grade caveman?
Buggers. I got 4 wrong. One's kind of a trick question. (via Hawks)