New DNA evidence could explain what happened to the Neanderthals

One of the great mysteries of early human evolution is what happened to extinct hominin groups like the Neanderthals and Denisovans. These were human groups who lived in Europe and Asia for hundreds of thousands of years before Homo sapiens started streaming out of Africa and taking over the world. Now, an… » 8/30/12 3:21pm 8/30/12 3:21pm