A window into dreams may now be opening. Silver Screen Collection/Getty Images hide caption

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Men walk along a railway line in Beijing on Jan. 12, as air pollution reached hazardous levels. Wang Zhao/AFP/Getty Images hide caption

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The anthrax vaccine has been given to more than 1 million adults in the military. But no one knows how well it would work in children. Randy Davey/Reuters/Landov hide caption

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A woman uses a cellphone while driving in Los Angeles in 2011. Damian Dovarganes/AP hide caption

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Klebsiella pneumoniae, seen here with an electron microscope, are the most common superbugs causing highly drug-resistant infections in hospitals. Kwangshin Kim/Science Source hide caption

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Giancario Gemignani-Hernandez, 2, of Pittsburgh has his ear examined by Dr. Alejandro Hoberman. Gene J. Puskar/AP hide caption

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Kimberly Delp gives a flu shot to Carleen Matthews at the Homewood Senior Center in Pittsburgh, Pa., last September. Andrew Rush/AP hide caption

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Some sports supplements contain the ingredient DMAA. The FDA has warned that DMAA may not be safe. iStockphoto.com hide caption

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Health researchers say the proportion of people in their late 40s to 60s with diabetes, hypertension or obesity has increased over the past two decades. iStockphoto.com hide caption

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An FDA advisory panel voted to increase controls on painkillers containing hydrocodone, such as this generic version of Vicodin. Sue Ogrocki/Associated Press hide caption

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