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

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Police officials stand next to a bullet-ridden Seattle Metro bus on Aug. 12. A man with a history of mental illness shot and wounded the driver, then died in a chaotic shootout with police. Ted S. Warren/AP hide caption

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Flags fly at half-staff Tuesday after the deadly shootings at the Navy Yard in Washington, D.C. J. Scott Applewhite/AP hide caption

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Beer pong and other drinking games are popular among teenagers, and play a role in binge drinking. iStockphoto.com hide caption

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I told him he would break his arm if he did that. But he did it anyway. iStockphoto.com hide caption

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Strenuous mental exercise like reading difficult books, solving tricky math problems — or, maybe, playing the right video game — can help keep a healthy brain sharp, research suggests. Images.com/Corbis hide caption

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Beautiful or creepy? A recent survey found that an image of a lotus seed head makes about 15 percent of people uncomfortable or even repulsed. tanakawho/Flickr.com hide caption

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