Group differences in IQ are best understood as environmental in origin.
Nisbett, Richard E.; Aronson, Joshua; Blair, Clancy; Dickens, William; Flynn, James; Halpern, Diane F.; Turkheimer, Eric; American Psychologist, 2012, vol. 67, issue 6, p 503, ISSN 0003066X. ISBN 0003066X.

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