The definitions for some mental disorders may change in the new edition of the DSM. Mark Strozier/iStockphoto.com hide caption

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Brothers Eric (from left) and Tom Hoebbel have the same genes, but they couldn't be more different. Courtesy of Tom Hoebbel hide caption

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Through the lens of evolution, a belief in God serves a very important purpose: Religious belief set us on the path to modern life by stopping cheaters and promoting the social good. iStockphoto.com hide caption

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When The Levees Broke: The rate of suicide in 2008 and 2009 in Orleans Parish was about twice as high as it was the two years before the levees broke.  Above, the 17th Street Canal Levee. Mario Tama/Getty Images hide caption

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Is This Evolution? This is just one version of the iconic illustration of evolution, but reporter Alix Spiegel believes this type of depiction doesn't tell enough of the story of what truly makes us human. Giovanni Caselli hide caption

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We know relatively little about whether the pain that follows a loss is, in a health sense, necessary. iStockphoto.com hide caption

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Voice blindness, or phonagnosia, is a rare disorder that has to do with how the brain processes voices. iStockphoto.com hide caption

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Though people with Williams Syndrome are known for being hyper-social, the disorder has many other facets, some of which are incredibly isolating. iStockphoto.com hide caption

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