A Pennsylvania woman developed a urinary tract infection cased by Escherichia coli bacteria that were found to be resistant to colistin, an antibiotic that is seen as the last line of defense. Nature's Geometry/Science Source hide caption

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In a study of 1.3 million women, ages 40 to 74, having a false positive on a screening mammogram was associated with a slightly increased chance that the woman would eventually develop breast cancer. The extra risk seemed to be independent of the density of her breasts. Lester Lefkowitz/Getty Images hide caption

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False Alarm Mammograms May Still Signal Higher Breast Cancer Risk
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Outsiders might be unfamiliar with the U.K.'s National Health Service, but Brits love it so much that they devoted part of opening ceremonies at the 2012 London Olympics to the NHS. Courtesy of BBC One hide caption

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Sir Elton John speaks Monday at the 19th International AIDS Conference in Washington. Carolyn Kaster/AP hide caption

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Poll: What It's Like To Be Sick In America
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Service members model the Modified Service Dress Blue Sweater. The Commissioned Corps of the U.S. Public Health Service requires that members wear either the sweater or a windbreaker. Commissioned Corps of The U.S. Public Health Service hide caption

toggle caption Commissioned Corps of The U.S. Public Health Service