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In this book, Lynn analyzes the results of over 500 published studies that span ten population groups—races and sub-races worldwide—in what is certain to be a path-breaking book for IQ experts and educated laypersons alike. This comprehensive review of worldwide racial differences of general intelligence explores the formation of races, meaning of intelligence, validity of race differences in IQ, environmental and genetic correlates of intelligence, the relationship between brain size and intelligence, the evolution of racial differences in intelligence, and the factor of racial hybrids. In a relentlessly methodical approach, Lynn expands upon an extensive array of research findings from the biomedical and social sciences, including the latest studies from the fields of behavior genetics, evolutionary psychology, and anthropology in reaching his thought-provoking conclusions. Extensively referenced, this exhaustive study of race and IQ is a milestone accomplishment and should serve as the yardstick by which future research is measured.