I guess one can ask the same question of Native Americans as the one you've asked about Africans; Why are they so much taller than the San and why the straight hair; but then you realize that they are not all six feet tall and both height and hair texture is more the result of epigenetics. Couple that with the fact that the Euro-Scientists are now realizing that maybe Darwin's survival of the fittest theory doesn't hold as much weight as space and movement.
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