Commenter "High Arka" said after the previous post that it reminded her of the book Erectus Walks Amongst Us. I looked it up and have read several chapters at random. So far it's fascinating, one of the best summaries of racial differences -- on a lot of different parameters -- I've ever read.
Evidently author Richard D. Fuerle's primary thesis is that the races separated much earlier than commonly thought. I haven't read enough to form any sort of opinion on that, and in any case it's not the sort of question that will have a definitive answer anytime soon. But whether or not you buy that theory, his summary of genetic differences between the races is worth reading.