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...2-13. Retrieved 2018-11-29.</ref> Further, explaining the similarity in IQ of closely related persons requires careful study because environmental factor ...D 45170027</ref><ref>Daniele, V. (2013). "The burden of disease and the IQ of nations". ''Learning and Individual Differences''. '''28''': 109–118. doi ...

...[[racism]], the belief that humans can be divided based on the superiority of one race over another. ...s, and biologists proves that race is not and cannot be a natural division of human beings.}}</ref> ...