The second episode was about Africa. The biggest part of what they discussed was how we developed in Africa. The suggestion was that a number of different near modern humans developed in different parts of Africa. Then they all got together and we are the result of hybridization among the various people. This is in contrast to the idea that some have held that modern humans developed in just one area and then spread from that area.
They also discussed the discovery that we all, except Africans, have some Neanderthal in our ancestry.
I don't have any particular problems with what they said and how they presented it. It makes an interesting story, and such a development would go a long ways towards explaining a lot of the archaeological evidence, which is not particularly clear. There certainly appear to be different places in Africa which show bits of modern humanity that aren't quite fully modern.
Bill Gill
