Sounds right when you think about it

Seems that Africans are more genetically diverse, and genetically stronger, than the rest of us (this courtesy of a Fox News on-line article and the prodding of an African-American friend of mine).
As would be expected with the "out of Africa" theory, the researchers found Africans had the greatest amount of genetic diversity, followed in turn by Middle Easterners, then Europeans and South Asians at about equal levels, then East Asians. Native Americans had the least genetic diversity of all, indicating that part of the world was settled last.
Some revelations weren't even surprising to a student of history like Rico: "The Basques in northeastern Spain and southwestern France may be right to demand their own nation — they're not closely related to anyone else."
"It's been known for years that all non-Africans are descended from a small group, perhaps only a few dozen individuals, who left the continent between 50,000 and 100,000 years ago."

Rico says that it's hard to imagine a world so empty of people that "a few dozen individuals" could found all the nations outside Africa...