How different are the “races” really? According to the graphic on http://www.understandingrace.org/humvar/race_humvar.html not that much.
This is a great Flash demo that shows that while there is a relatively large amount of diversity in Africa, the home of homo sapiens (at least beneath the skin), it’s much smaller in Europe and Asia. In fact, it’s so small that the Asian and European circles are almost right on top of each other. That’s a lot of people with a lot of common DNA!