Health workers sit at the emergency entrance of a Doctors Without Borders clinic in Monrovia. New data seem to show a decline in Ebola cases in Liberia, WHO says. Zoom Dosso/AFP/Getty Images hide caption

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Berkeley's efforts to pass a penny-per-ounce tax on sugary drinks faced opposition with deep pockets — but it also got sizable cash infusions from some big-name donors. Justin Sullivan/Getty Images hide caption

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Air Force personnel put up tents to house a 25-bed, U.S.-built hospital for Liberian health workers sick with Ebola in Monrovia, Liberia's capital. The hospital is scheduled to open this weekend. John Moore/Getty Images hide caption

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In 49 U.S. states, spotting the squished disc in this spinal MRI is still much easier than learning the price of the MRI in advance. AWelshLad/iStockphoto hide caption

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Students taking part in Columbia University's Ebola design challenge demonstrated for judges how to use a special chamber for decontaminating small items. Courtesy of Columbia Engineering hide caption

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The majority of voters in San Francisco and Berkeley, Calif., voted in favor of a soda tax, but the measure didn't gain the required two-thirds majority required in San Francisco. Justin Sullivan/Getty Images hide caption

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A young boy suspected of having Ebola lies in a back alley of the West Point slum in Liberia. Research suggests that the story of one needy individual motivates charitable donors more than statistics about millions of sufferers. John Moore/Getty Images hide caption

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The scariest part of the holiday comes in the days that follow, as parents fight and negotiate to limit how much candy their kids eat. NPR's Gisele Grayson decided to pay her kids off to give up their loot. iStockphoto hide caption

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A child receives a polio vaccine during National Immunization Days in the Nigerian city of Kano. Diego Ibarra Sanchez /Courtesy of Rotary Foundation hide caption

itoggle caption Diego Ibarra Sanchez /Courtesy of Rotary Foundation