Scientists are now sifting through the gene pool, sorting meaningful elements from evolutionary dead ends. The matter is vital to understanding the contention of many scientists that racial differences are such a small part of the human genome as to be biologically insignificant. Race, they say, is a sociological, not genetic, construct. One would need to be blind not to find some tug in the notion that the Kenyan domination of running may have a biological root. At the elite level, even tiny differences in biology can separate winners from losers.
Human bloodlines are hopelessly and blessedly crossed.