A critical review of Jensen's book which contains a reprint of the original controversial 1969 "Harvard Educational Review" article, 5 related articles by Jensen, and a bibliography of related articles. (EH)

A case study of a pair of extremely deprived twin boys focuses on their verbal communication. Talkativeness alone was not regarded as a measure of intelligence, but attention was paid to the less talkative twin's greater use of imaginative speech. Speculations are made on the evolutionary role of creative speech. (IS)