In Chapter 3, Reich talks about the discovery of the Denisovans, a sister archaic group to the Neanderthals that lived in eastern Asia. It all started out with a pinky bone found in a cave in southern Siberia. The DNA in the little bone was very well preserved – they got better info from that one bone than all previous Neanderthal DNA work. It’s an odd situation – we now know a lot about Denisovan genetics, but we don’t have a skeleton and have no idea what they looked like.
The Denisovans were closer to the Neanderthals than they were to AMH, but not by much. Apparently modern humans split with the common ancestors of Denisovans and Neanderthals about 700,000 years ago, while Neanderthals and Denisovans separated not much later. Almost a trichotomy. Something similar happened when AMH spread into Eurasia: quite early, maybe 50,000 years ago, we split into…
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Utopia, you are standing in it! 
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