Same-sex marriage advocates protest outside the county clerk's office in San Francisco on Feb. 14. Justin Sullivan/Getty Images hide caption

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Building your own stuff boosts your feelings of pride and competence, and also signals to others that you are competent. hide caption

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When times are tough, that prehistoric urge to splurge on high-calorie treats like M&Ms still kicks in. Daniel M.N. Turner/NPR hide caption

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Prison provides an opportunity for networking with more seasoned criminals. hide caption

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Top schools like Harvard, seen here in 2000, often offer scholarships and other financial incentives, but they are finding it hard to increase the socioeconomic diversity on campus. Darren McCollester/Getty Images hide caption

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George Zimmerman (left) and his attorney appear in court for a bond hearing in June. Zimmerman's case sparked a nationwide debate about so-called "stand your ground" laws. Joe Burbank/AP hide caption

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Posting a picture like this on the fridge might seem like good motivation for weight loss. But scientists say it might instead inspire weight gain. hide caption

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