Entine: A hundred years, or even a few hundred years, are eye blinks of evolutionary time. The differences we see among populations are grounded in thousands of years of traveling separate evolutionary paths.
Certainly, the human body is somewhat "plastic." As nutrition improves, body types will change. But only within a range. All the nutrition and training in the world cannot turn a Kenyan into a sprinter, a Nigerian into a marathoner or a Taiwanese into the next great long jump or high jump athlete. It just won't happen.
But as humans move around and fool around -- as our nations of race continue to blur -- racial differences will gradually become less pronounced.
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