Why do you think this subject arouses "hypersensitivity"?
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There is no such thing as subspecies of humans. Races haven't evolved. Peoples' idea of race has evolved. What some call race is merely a function of gene pooling. Offspring carry traits of their parents. Eventually, some people may arbitrarilly label sucha pool as a race. No one has been able to consistently define race, especially products of "mixed race." Before one can discuss race (as with any other subject), then the term "race" must be defined.