How much can we boost IQ and scholastic achievement?--A theory of primary and secondary familial mental retardation.--Estimation of the limits of heritability of traits by comparison of monozygotic and dizygotic twins.--IQs of identical twins reared apart.--Genetic research on human mental abilities: ethical issues.--A note on why genetic correlations are not squared.--References.--Bibliography (1) articles about "How much can we boost IQ and scholastic achievement?" (p. 356-364)--Bibliography (2) articles on genetics and individual differences by A. R. Jensen (p. 365-369)