We Have Another Set of Cousins in the Human Race

So we have several evolutionary branches on the Human Tree it turns out. Scientists have found Neanderthal genes in modern humans and now we have another set of relatives, the Denisovans. It turns out that, as predicted by several anthropologists, our family tree looks more like an entwined vine than a single solid tree trunk.

As always, it's more complicated than most folks thought. Here's a place to start.