 | Chess players, 8990, 98 n
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 | Children
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 | aggression and high-testosterone, 103
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 | boy-girl difference in relationship styles and adult morality, 183184
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 | delinquency, 85, 130131, 212
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 | dominance in, 6263
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 | early sexual activity and criminality, 103
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 | geography, superiority of boys, 52
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 | Headstart program, socializing benefits of, 211
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 | learning disabilities and behavior problems, testosterone levels and, 8687
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 | parenting and, 211212
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 | play area, boys versus girls, 52
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 | "toy truck gene," 57
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