there are simple things to learn, such as whom to love or hate, what values to honor, how to act in important ceremonies, and how to treat one's enemy. As the world gets more complicated, it takes longer to learn all the things we need to know. It takes only a few hundred hours to master most complex skills. One can solo an airplane, for example, after ten to twelve hours of training and become a fair pilot after a hundred hours of practice. But learning to be an accountant, surgeon, lawyer, business executive, or college professor takes at least ten years of intensive study and practice to acquire the memory store to reach "world-class" performance. 14 Finding one's place in modern society is a long, drawn-out initiation rite that takes motivation, fortitude, years in school, and good control of rambunctious impulses. Strong and stable social institutions teach us what to do and how to control our impulses, including our impulses that come from testosterone.
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The study of 4,662 military veterans showed how important social control is. In Chapter 4, I said that veterans in the top 10 percent of the testosterone distribution misbehaved more than othersthey had more trouble with the law, hard drug use, and marijuana use. In order to see how social differences might affect these findings, I looked at education and income. People who have more education and higher incomes are said to be higher in socioeconomic status, or "SES." I classified veterans who were below average in both income and education as low in SES, and those who were above average in both as high in SES. I dropped about a third of the veterans who were above average on one and below average on the other, but the remaining two-thirds made up two distinctly different groups.
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Overall, there was a negative relationship between testosterone and SES. High-testosterone men were twice as likely to be in the low than in the high SES group, as described in Chapter 6. Looking at the data further, I saw something even more interesting in the relation involving testosterone, SES, and delinquency. Although there were high-testosterone men in both SES groups, testosterone was more strongly related to delinquency in the low than in the high-SES group. Figure 9.1 shows risk ratios in the two groups. As in Chapter 4, the risk ratio indicates how much more likely a behavior is among men with high than with normal testosterone levels. Figure 9.1 shows risk ratios separately for men in the low- and high-SES groups. The risks of adult delinquency
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