The FDA hasn't approved a new weight-loss drug since 1999. In the meantime, Americans' waistlines have continued to grow. M. Spencer Green/AP hide caption

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When it comes to taking up residence in your intestines, Clostridium difficile, like these, may get some help from common heartburn drugs. Janice Carr/CDC hide caption

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An artist on Rio de Janeiro's Copacabana beach puts the final touches on a sand sculpture of the assassin bug, which spreads Chagas disease. The sculpture was part of an event in 2009 commemorating the 100th anniversary of the discovery of the disease. Vanderlei Almeida/AFP/Getty Images hide caption

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Some patients with PTSD suffer recurring nightmares of a single event. / hide caption

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A customer walks out of a Walgreens store in New York City. Adam Rountree/Bloomberg via Getty Images hide caption

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Watson Pharmaceuticals, a maker of generic drugs, is rolling out generic Lipitor, or atorvastatin, under a deal with Pfizer. Bill Gallery/AP hide caption

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