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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In 2013, Zika virus was found in French Polynesia, including the island of Tahiti (above). Some 20,000 inhabitants were diagnosed with the disease. Andy Bardon/National Geographic hide caption

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No, he didn't repossess this car from a corrupt official. As a hobby, global health avenger Cees Klumper fixes up classic cars. This one is the actual El Camino used in the TV series My Name Is Earl. Klumper tracked it down and had it shipped to Geneva. Courtesy of Anneke Cees Klumper 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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A patient is pictured at a camp for diarrhea patients in Dhaka, Bangladesh. Among the nominations for untold story last year: the need for vaccines to prevent "severe, deadly diarrhea" in this part of the world. Zakir Hossain Chowdhury/Barcroft Media via Getty Images hide caption

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Jeneyah McDonald stands amid cases of bottled water in the kitchen of her home in Flint, Mich. Before water donations arrived in Flint, McDonald says, she spent an estimated $100 out of her $300 weekly grocery bill buying safe water for her family. Laura McDermott for NPR hide caption

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