A worker stands on top of a storage bin on July 27, 2011, at a drilling operation in Claysville, Pa. The dust is from powder mixed with water for hydraulic fracturing. Keith Srakocic/AP hide caption

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A new study from the Centers for Disease Control and Prevention finds no link between the number of vaccinations a young child receives and the risk of developing autism spectrum disorders. Jeff J. Mitchell/Getty Images hide caption

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A microscopic image of prostate cancer. Researchers have found new genetic markers that flag a person's susceptibility to the disease, as well as breast and ovarian cancer. Otis Brawley /National Cancer Institute hide caption

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Otolaryngologist Sandra Lin uses under-the-tongue drops to treat patients with allergies at Johns Hopkins in Baltimore. Courtesy of Keith Weller/Johns Hopkins Medicine hide caption

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George McCann has been diagnosed with a subtype of bipolar disorder called the "fear of harm" profile, and finds that a prescribed dose of ketamine every few days alleviates his symptoms. Michael Rubenstein for NPR hide caption

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A towel covers the face of a man in a geriatric day care facility of the German Red Cross at Villa Albrecht in Berlin. Carsten Koall/Getty Images hide caption

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Robert Monges, a coach for James Lick High School, checks tight end Dominic Brewster for a concussion during a football game played in Morgan Hill, Calif., in 2006. Patrick Tehan/San Jose Mercury News/MCT/Landov hide caption

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Lauren Fant winces as she receives her third and final shot of HPV vaccine from nurse Stephanie Pearson in Marietta, Ga., in 2007. John Amis/AP hide caption

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An electron micrograph of HIV particles infecting a human T cell. French researchers say they've found 14 patients with so little HIV virus in their blood that the patients have gone into "long-term remission." National Institute of Allergy and Infectious Diseases hide caption

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Students at the College of Central Florida in Ocala, Fla., perform CPR on a mock patient. Bruce Ackerman/Ocala Star-Banner /Landov hide caption

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Ten milligram tablets of the prescription drug Adderall. The drug is used to treat ADHD and is used by some students to boost their academic performance. Jb Reed/Bloomberg via Getty Images hide caption

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