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Who's there? A radiologist studies digital X-rays in a viewing room at what is now called the Walter Reed National Military Medical Center in Bethesda, Md. Seth Rossman/U.S. Navy hide caption

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The Rev. Eric Williams and his colleague Jannette Berkley-Patton visited StoryCorps in Kansas City, Mo., where they discussed a funeral that shaped Williams' future. StoryCorps hide caption

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United Nations Aids Executive Director Michel Sibide hugs Secretary of State Hillary Clinton after they they presented the a road map for stopping HIV around the world. Jim Watson/AFP/Getty Images hide caption

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Spinach has lots of opportunities to pick up E. coli and other bugs during harvest and growing. Here, a Mexican migrant worker cuts organic spinach during the fall harvest at Grant Family Farms in Wellington, Co. John Moore/Getty Images hide caption

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How much is it worth? iStockphoto.com hide caption

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Keith Gresham, 65, lines up four medications he takes at his home in Detroit in 2011. The self-employed painter was without health insurance for about a decade and was happy to finally turn 65 last year so he could qualify for Medicare. Patricia Beck/MCT/Landov hide caption

itoggle caption Patricia Beck/MCT/Landov

Scientists say that the best way to reduce a person's contact with the flame retardant chemicals in sofas and other furniture is to vacuum more. SINAN DONMEZ/iStockphoto.com hide caption

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At a Los Angeles media briefing in 2010, Mariah Bianchi describes how her own case of whooping cough caused the death of her newborn son. Reed Saxon/AP hide caption

itoggle caption Reed Saxon/AP