Re: Race
We know that skin colour is controlled by genetics but we never ask ourselves why it's distributed in all its variations in the way that it is - it's a minor point really, we're all pink on the inside and happily copulate to generate new variations/generations ... 80,000 years is a lot of generations and our known historical record only goes back about 15,000.
I think it's more likely that there aren't any mystery ancestors - the variations we see today are just the result of isolation - take a population and isolate it in chunks for a couple of hundred thousand years a time, and then rinse and repeat ... Do that for two or three million years and you've got modern genetics.