The Evolution of Cooperation insects, where the workers – which are sterile, and therefore incapable of passing on their genes – benefit the queen, who is essentially passing on copies of "their" genes. This is further elaborated in the "selfish gene" theory of Richard Dawkins, that the unit of evolution is not the individual organism, but the gene. (As stated by Wilson: "the organism is only DNA's way of making more DNA.") However, kinship selection works only where the individuals involved are closely related; it fails to explain the presence of altruism and cooperation between unrelated individuals, particularly across species. In a 1971 paper
Richard Dawkins: How a Scientist Changed the Way We Think Ridley. () The reviews of the book have been mixed, but the controversial title phrase, "How a Scientist Changed the Way We Think" has been explained by considering Dawkins to have worked as an influential educator and concise author, of "The Selfish Gene", who promoted the key ideas of others about evolutionary biology, also including some controversial ideas which are not as widely accepted. As the author of a popular science book, Dawkins had popularized ideas by George Williams about group selection, William Hamilton on the theory of kin selection in evolution, biologist/geneticist John Maynard Smith on evolutionarily stable strategies,