Ronald Heifetz draws on his training as a psychiatrist to coach aspiring leaders at Harvard's John F. Kennedy School of Government. Ben de la Cruz/NPR hide caption

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Kids might be more satisfied if they get one good treat instead of one good treat and one lesser treat. iStockphoto.com hide caption

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When it comes to nature versus nurture, brain scientists think both matter. Daniel Horowitz for NPR hide caption

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Football fans ate fattier meals the day after their teams lost a game, a study found. iStockphoto.com hide caption

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Security guards stand outside newspaper offices in Guangdong province in January, where banners and flowers were laid in protest of censorship. AP hide caption

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The poor tend to value social connections, psychologists say. But as people become wealthy, they need one another less and — according to some scientists — make fewer connections. Images.com/Corbis hide caption

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Girls are more likely to take high school physics if they see women in their communities working in science, technology, engineering and math, a new study finds. Dominik Pabis/iStockphoto.com hide caption

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Student Kahlil Quato fights tears as he speaks at a University of Chicago candlelight vigil in 2007. The service was held in remembrance of Amadou Cisse, a graduate student, who was shot to death at point-blank range. Stacie Freudenberg/AP hide caption

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Happy Birthday: Cake, candles and cone-shaped hats make regular appearances at birthday parties. What gives? William Gottlieb/Corbis hide caption

itoggle caption William Gottlieb/Corbis

Opponents of same-sex marriage participate in the March for Marriage in Washington, D.C., on March 26, as the Supreme Court hears arguments on California's Proposition 8 ban on same-sex marriage. Nicholas Kamm/AFP/Getty Images hide caption

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One contemporary analysis links the increase in gender equality in a society with increased sexual empowerment of women and less sexual coercion. But there's more to it than that. iStockphoto.com hide caption

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