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“Chimpanzees are our nearest living relatives, and offer hints as to how our distant ancestors may have behaved. Chimps live in bands within territories, and show a ferocious in-group out-group consciousness. It has long been known that males drive off intruders from other bands and kill their young if they can. Psychologists watching chimps in Uganda found that even females are murderously territorial. On three occasions they saw females drive off invaders and kill their babies. People often behave according to genetic similarity theory, and the scholar who has probably written most extensively in this field is J. Philippe Rushton of the University of Western Ontario. “Genetically similar people tend to seek one another out and to provide mutually supportive environments such as marriage, friendship, and social groups,” he has written. For example, spouses tend to resemble each other, not just in age, ethnicity, and education (r = 0.6) but in opinions and attitudes (r = 0.5), intelligence (r = 0.4), and even in such things as personality and physical traits (r = 0.2). They are even like each other in undesirable traits such as aggressiveness, criminality, alcoholism, and mental disease. It is possible to predict how happy a couple is by know.” — Jared Taylor