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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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

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Grapefruit can make for a tasty addition to breakfast. But it can also interfere with some medications. iStockphoto.com hide caption

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Lidia Bastianich's great-aunt swore by a horseradish tea for clearing out cold-clogged sinus. iStockphoto.com hide caption

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Hospitals began testing blood for hepatitis in 1992, so anyone who received a blood transfusion before then is at an increased risk for contracting the disease. iStockphoto hide caption

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Researchers find that more than 40 percent of surgical complications happen after patients leave the hospital. iStockphoto.com hide caption

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Medical marijuana advocates demonstrate outside a San Francisco fundraiser for President Obama in February. Justin Sullivan/Getty Images hide caption

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New England Compounding Center co-owner Barry Cadden went to Capitol Hill for a congressional hearing Wednesday on the fungal meningitis outbreak. Choosing to take the Fifth Amendment, Cadden did not testify. Susan Walsh/AP hide caption

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Lyme disease is spread by deer ticks like this one. A study finds that some people can be reinfected many times with the bacteria that cause the disease. Lauree Feldman/Getty Creative Images hide caption

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Claire Lomas walks the last mile of the London Marathon on May 8, 2012 in London, England. After a riding accident left her paralyzed from the waist down in 2007, Lomas completed the race walking 2 miles a day over 16 days with the help of a ReWalk bionic suit (by Argo Medical Technologies). Peter Macdiarmid/Getty Images hide caption

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On Election Day, residents in Colorado and Washington state voted to legalize the recreational use of marijuana. Above, marijuana plants grow at Perennial Holistic Wellness Center in Los Angeles. David McNew/Getty Images hide caption

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