Chapter 13 of Human Development Psychology: Updated Biology and Environment box on telomere length as a marker of the impact of life circumstances on biological aging New statistics on overweight and obesity in adulthood, including international comparisons, variations among U.S. ethnic groups, and approaches to treatment New research on substance abuse in early adulthood, including sex differences in progression to alcohol dependence New findings on sexual attitudes and behavior among young adults, including Internet dating, sex differences in number of lifetime partners, sex without relationship commitment on U.S. college campuses, same sex relationships, and implications of sexual activity for life satisfaction Discussion of generational differences in acceptance of same-sex marriage, including high acceptance by Millenials Updated section on risk of sexually transmitted infections (STIs) in early adulthood, with special attention to HIV/AIDS Revised and updated evidence on sexual coercion Updated evidence on cognitive ingredients of creativity, including reduced inhibition of information that, at first glance, appear irrelevant New Social Issues: Education box on the importance of academic engagement in college for successful transition to the labor market Enhanced consideration of women's progress in choosing male-dominated careers, with special attention to college women talented in math and science.

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