An interesting discussion on the origins of man.

Rethinking Out of Africa

We may find there are other people than the Denisovans and the Neanderthals to be recognized from their DNA in these regions— there may well be more surprises to come. For example there is evidence both from fossils and recent DNA that even Africa had an overlap of modern and archaic humans, with the possibility in a continent so large that there were other descendants of heidelbergensis living there alongside Homo sapiens. These populations could have exchanged DNA too, evidence of which might be found in the genomes of living Africans. We will also get the first good look at functional DNA in the genomes of ancient individuals. For the first time, we can make a comparison, not just between the chimp genome and the modern human genome, but we can now add in the Neanderthal genome and the Denisovan genome. We can start to see what unites those three human genomes compared with the chimpanzees. What evolved along the modern human line to make us what we are? And then individually, what made the Neanderthals what they were? What made the Denisovans what they were? This will have an impact, of course, on our own nature, what makes a modern human a modern human. Already a number of bits of DNA have been identified that are distinct among humans, where the Neanderthals are like chimpanzees.

It's a long slog, but read the whole thing.

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