The book grew out of Rushton's 1989 paper, "Evolutionary Biology and Heritable Traits (With Reference to Oriental-White-Black Difference)". The 1st unabridged edition was published in 1995, the 2nd unabridged edition in 1997, and the 3rd unabridged edition in 2000. Rushton argues that Mongoloid, Caucasoid and Negroid populations fall consistently into the same one-two-three way pattern when compared on a list of sixty distinctly different behavioral and anatomical traits and variables. Rushton uses averages of hundreds of studies, modern and historical, to assert the existence of this pattern. Rushton's book is focused on what he considers the three broadest racial groups, and does not address other populations such as
Southeast Asians and
Australian Aborigines. The book argues that Mongoloids, on average, are at one end of a continuum, that Negroids, on average, are at the opposite end of that continuum, and that Caucasoids rank in between Mongoloids and Negroids, but closer to Mongoloids. His continuum includes both external physical characteristics and personality traits. which attempts to apply
r/K selection theory to
human races. According to Rushton, this theory explains race differences in fertility, IQ, criminality, and sexual anatomy and behavior. The theory also hypothesizes that a single factor, the "
K factor", affects multiple population statistics Rushton referred to as "life-history traits". This theory has been widely rejected as unscientific or
pseudoscientific. Rushton's work includes logical errors, cites poor-quality sources,
ignored contrary sources, and cites sources which Rushton had misinterpreted or misunderstood. == Responses ==