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An image from the Allen Institute's Brain Explorer shows gene expression across the human brain. Courtesy of Allen Institute For Brain Science hide caption

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Kate Teague, a registered nurse at Lucile Packard Children's Hospital, in Palo Alto, Calif., holds a premature baby's hand. Heidi de Marco/Kaiser Health News hide caption

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Omar looks through Kai's photo book. The charges for the infant's six months of care in the neonatal intensive care unit totaled about $11 million, according to the family, though their insurer very likely negotiated a lower rate. Heidi de Marco/KHN hide caption

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Birth control pills are 99 percent effective in preventing pregnancy, research shows — but only if you remember to take them as prescribed. Rod-shaped implants, T-shaped IUDs and vaginal rings are other options. BSIP/Science Source hide caption

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For people 50 and older at a high risk for heart disease or stroke, an aggressive approach to treatment has advantages. But there are risks, too. iStockphoto hide caption

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Physical exercise, diet and supportive counseling are the first steps of any weight-loss program. But sometimes that's not enough to take large amounts of weight off, and keep it off, doctors say. 13/Ocean/Corbis hide caption

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(Left to right) NYU medical students Brian Chao, Michael Lui, Hye Min Choi, and Varun Vijay take the team approach to learning about the anatomy of cells, and how disease can disrupt them. Analyzing big data sets is now a routine part of their studies, too. Cindy Carpien for NPR hide caption

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Neuroscientist Takashi Kitamura works in the lab of Nobel laureate Susumu Tonegawa at the Massachusetts Institute of Technology. One of their recent projects helped identify a brain circuit involved in processing the "where" and "when" of memory. "Ocean cells" (red) and "island cells" (blue) play key roles. Takashi Kitamura/MIT hide caption

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A woman's health history and tolerance for different kinds of risks should have a legitimate role in determining the timing of when she starts and stops getting screening mammograms, some leading doctors say. Sally Elford/Ikon Images/Getty Images hide caption

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The American Cancer Society has pushed back the age at which most women should begin having mammograms to 45. iStockphoto hide caption

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Researchers have used MRI scanners to learn that preemies are born with weak connections in some critical brain networks. iStockphoto hide caption

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Although false alarms are not at all unusual when it comes to mammograms, they can cause women much anxiety. Doctors are thinking about ways to ease those fears. iStockphoto hide caption

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In addition to heart problems triggered by some supplements, emergencies often arise when kids swallow dietary supplements meant for adults, according to the CDC analysis, or when older adults choke on the pills. Lee Woodgate/Ikon Images/Corbis hide caption

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