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Ancient toe might prove that all ancient humanoid species were constantly having sex with each other

Late last year, we learned that early humans and Neanderthals once shared Eurasia with a third hominin group, known as Denisovans. Now, the new discovery of a Denisovan toe bone might indicate that these three hominin groups were pretty much constantly interbreeding. » 8/10/11 3:39pm 8/10/11 3:39pm