I recently saw a Discovery program about a researcher who was DNA mapping humans from all over the world. I can’t remember the name of the program, I think it was “The Journey of Man”. He was trying to find out when ancient man migrated from Africa, and which routes they took and when.
Apparently there were two main migrations, one about 40000 years ago, and another much later, possibly 20000 to 15000 years ago. It seems that the ancestors of the present population of Europe didn’t come straight up from Africa, but moved first into central Asia and China before moving on to Europe later. He found a man in the middle of Asia whose DNA could be traced back 2000 generations, that’s to say about 40000 years. Some family tree he must have!
He concluded the program by stating that since we all originate from the same original people, we are, of course, in actual fact all the same race. We have just evolved differently. So the whole idea of racism is nonsense.

I’m no expert on this subject, but do feel that it gives food for thought.

(he he, I managed to get the words “racism” and “evolved” in the same post!)