Teachers interact differently with students expected to succeed. But they can be trained to change those classroom behaviors. iStockphoto.com hide caption

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A less complicated time? Petula Clark holds her 1965 gold record for "Downtown," an uptempo song in a major key. R. McPhedran/Getty Images hide caption

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Wanda Kaczynski and her son David Kaczynski (right background) are escorted to their car by defense lawyers after Unabomber Theodore Kaczynski pleaded guilty Jan. 22, 1998, in Sacramento, Calif. John G. Mabanglo/AFP/Getty Images hide caption

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Kimberly Payton, a teacher at the Small Savers Child Development Center, reads to a group of preschoolers in Washington, D.C., in 2010. Researchers say that teachers who make small changes in how they read to 4-year-olds can improve kids' reading skills later on. Ricky Carioti/The Washington Post/Getty Images hide caption

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People who are interested in and paying close attention to each other begin to speak more alike, a psychologist says. iStockphoto.com hide caption

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The antidepressant Prozac selectively targets the chemical serotonin. Paul S. Howell/Getty Images hide caption

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U.S. soldiers at Long Binh base, northeast of Saigon, line up to give urine samples at a heroin detection center in June 1971, before departing for the U.S. AP hide caption

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Indian firefighters attempt to put out a fire as smoke billows out of the historic Taj Mahal Hotel in Mumbai, which was stormed by armed gunmen in November 2008. Indranil Mukherjee/AFP/Getty Images hide caption

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