Regarding my last post, I got my wires crossed, my Grey Flesh experienced a brief lapse of awareness :-) Regarding humanities spread out of Africa, that time frame as suggested by more recent DNA evidence describes a time frame starting about 70,000 years ago from the beginning of this great migration. The favorable climate of the last 10,000 years has provided optimum conditions for humanities recent proliferation, driven to the extreme in the last 200 years by the abundance of various hydrocarbon energy sources.