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Research into how the human brain develops helps explain why teens have trouble controlling impulses. Leigh Wells/Ikon Images/Corbis hide caption

itoggle caption Leigh Wells/Ikon Images/Corbis

Bradley Cooper (right) plays Chris Kyle in American Sniper. The film has become a cultural phenomenon and has spawned knee-jerk squabbling. Courtesy of Warner Bros. Pictures hide caption

itoggle caption Courtesy of Warner Bros. Pictures
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