A week or two ago, the GGG ping group posted something that suggested that the earliest inhabitants of North America were closely related to Australians, while the Asiatics whom Native Americans are related to were more recent.
Since the smartest people in the world are Asians and Jews, not likely a "smartness" mutation originated in Europe or among Indo-Europeans.
The oldest Mongoloid skeleton ever found is only 10k years old. (Professor Stephen Oppenheimer) If you've followed my posts, you'd know that I have been suggesting an Asian origin for Caucasians for some time now, specifically the Gansu Province of China. I think there were Caucasian 'like' people all over Asia before the Mongoloids arrived.
Further, Stephen Oppenheimer says that about 50% of Europeans can trace their DNA back to one man in the north Indus valley and this group made their way to Europe through the Middle East.
The other 50% of Europeans can trace their origins to a son of the same man who made their way to Europe a thousand years later through Russia. So...