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J.M. Thoday

Professor of Genetic Science at Sheffield and Cambridge Universities, Fellow of the Royal Society, co-author of Quantitative Genetic Variation, author of numerous articles and reviews about human intelligence

It is not true that everyone can reach the same academic standards if provided with adequate opportunities, and the heritability of IQ is a partial measure of that untruth.

1973 - from an essay in the journal Nature
...there are grave dangers in basing policies such as affirmative action on the assumption that all differences arise from environmental causes and all individuals are of identical potential.

1981 - from an essay in the journal Nature