Noah Cummings, 13, starts the morning with his mom, Heather Cummings, at home in Epsom, N.H. Ellen Webber for NPR hide caption

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High school students whose friends posted photos of drinking and smoking were about 20 percent more likely to become drinkers or smokers themselves. iStockphoto hide caption

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In the Institute for the Unsalvageable in Sighetu Marmatiei, Romania, shown here in 1992, children were left in cribs for days on end. Tom Szalay hide caption

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Being the littlest may mean more protection and care from parents, psychologists say. Getty Images/Image Source hide caption

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Colleen Frainey, 16, of Tualatin, Ore., cut back on advanced placement classes in her junior year because the stress was making her physically ill. Toni Greaves for NPR hide caption

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Play now, pay later: consistency matters when it comes to kids and sleep. hide caption

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Former NFL offensive lineman Brian Holloway in front of his home in Stephentown, N.Y., which teens trashed earlier this month. Michael Hill/AP hide caption

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Sure you're steamed. But teenagers tend to meet harsh words with even worse behavior, a study says. Katherine Streeter hide caption

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A first-year student is greeted upon arrival at University College in Utrecht, Netherlands, on August 16, 2010. Robin Utrecht/AFP/Getty Images hide caption

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A gene known as DRD2 affects the brain's dopamine system and is known to be associated with aggressive behavior. hide caption

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Laura Molina, 9, shows the mask she created expressing the feeling of "sadness." Her mother is being treated for breast cancer at the Lyndon B. Johnson public hospital in Houston. Carrie Feibel/KUHF hide caption

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