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A lab worker exposes his arm to Aedes aegypti mosquitoes, which transmit Zika virus, during testing in the lab at Roosevelt Hospital in Guatemala City, Guatemala. Saul Martinez/Bloomberg via Getty Images hide caption

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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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Contractors who supply workers to farmers say requirements of the Affordable Care Act and the immigration status of many of the workers create a Catch-22. Maguey Images/Getty Images hide caption

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Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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Maria Fabrizio for NPR

Republican presidential hopeful Ted Cruz initially claimed his private insurance had been canceled. It turned out his insurer had transferred him to a plan with a narrow network of providers. Andrew Burton/Getty Images hide caption

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December brought storm clouds to the Porter Ranch neighborhood in Southern California's San Fernando Valley. David McNew/AFP/Getty Images hide caption

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Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, says it's not clear whether Zika virus can spread through saliva. Alex Brandon/AP hide caption

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Multiple sclerosis pill Tecfidera is on the top 10 list of most costly specialty drugs, as measured by overall spending, for California's health benefit system for public workers and retirees. John/Flickr hide caption

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Sporadic dengue fever outbreaks in Florida in 2009 and 2010 spurred mosquito control efforts in Key West and Miami Beach, shown here. The same mosquito that carries dengue, Aedes aegypti, can transmit Zika. Joe Raedle/Getty Images hide caption

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Nancy Retzlaff, chief commercial officer for Turing Pharmaceuticals, was asked how much the drug Daraprim costs at the House Oversight and Government Reform Committee on Capitol Hill on Thursday. Brendan Smialowski/AFP/Getty Images hide caption

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Criminologist Joseph Richardson is skeptical that the federal government alone can solve the data problem for police shootings. "There has to be a more pioneering, innovative approach to doing it," he says. Spotmatik/iStockphoto hide caption

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