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Our family tree may be a lot messier than we thought

Different perspectives of a molar found at the Siberian cave Denisova. Credit: Slon et al. Sci. Adv. 2017

The story of human evolution goes something like this: humans evolved in Africa 300,000 years ago and about 70,000 years ago, a small group moved to other continents, giving us today's populations.

But two new studies suggest our family tree may be much more tangled than we previously thought. Scientists in Europe report evidence that modern humans and Neanderthals interbred much earlier than we thought, and that Neanderthals and their sister group of Denisovans may have had ample time to mingle.