The purpose of scientific inquiry, generally, is to shed light on causal mechanisms, not to describe artificial categories in terms that are inherently subjective.
Since human "races" are artificial categories, asking which "race" is more "intelligent" is like asking who is more beautiful, people whose names begin with consonants or people whose names begin with vowels. You might find an answer, but it would be meaningless as a genetic proposition because there is no genetic mechanism at issue.
Certainly it makes sense to ask questions about the correlations between genetic traits, but trying to say that these are caused by "race" confuses an unstable statistical phenomenon with a categorical one. Genetic correlations are in constant random flux in any finite group, and can arise, reverse sign, or disappear in a single generation due to the pattern of mating.
And speaking of scientific inquiry, it has shown that every person on the planet descended from the same man and woman in an African village that lived about 4000 generations ago. That's a blink of an eye in evolutionary time, and it means that we are all one race, and we're all Africans. Including James Watson.
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