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Obviously there are actual physical differences between the races.



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Nothing about race is obvious or universally accepted. From the Columbia Encyclopedia:

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Many physical anthropologists believe that, because there is as much genetic variation among the members of any given race as there is between different racial groups, the concept of race is ultimately unscientific and racial categories are arbitrary designations. The term race is inappropriate when applied to national, religious, geographic, linguistic, or ethnic groups, nor can the biological criteria of race be equated with mental characteristics, such as intelligence, personality, or character.

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