Each year thousands of people from around the world tour the Gomantong Cave in Borneo. Although scientists have found a potentially dangerous virus in bats that roost in the cave, no one has ever gotten sick from a trip here. Razis Nasri hide caption

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Razis Nasri

The Next Pandemic Could Be Dripping On Your Head

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Once called the "Dutchmen" because of their large noses and large bellies, proboscis monkeys live only in Borneo. Ecosystems that have a lot of diverse animals, like this monkey, also tend to have a lot of diverse viruses. Charles Ryan hide caption

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Charles Ryan

Why Killer Viruses Are On The Rise

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Alex Reynolds/NPR

How Do You Know If Aid Really Works? Turns Out ... We Often Don't

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Some workers in low-income countries are choosing bitcoin, a virtual currency powered by blockchain technology, to send money to their families. It's cheaper, faster and doesn't require a middleman. Andrew Baker/Getty Images/Ikon Images hide caption

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Andrew Baker/Getty Images/Ikon Images

Clockwise from upper left: Dr. Forster Amponsah; a Malick Sidbe photo taken in Mali; a global garden of radio; Chewa the TB-sniffing rat; another Sidbe photo; Olympic medalist Fu Yuanhui of China; the New Mexico cave where a superhero bacterium lived; poverty fighter Sir Fazle Hasan Abed; calligrapher Sughra Hussainy; activist Loyce Maturu. Jason Beaubien/NPR, Courtesy of Malick Sidibe and Jack Shainman Gallery, Katherine Streeter for NPR, Maarten Boersema/APOPO, Gabriel Bouys/AFP/Getty Images, Courtesy of Max Wisshak, Courtesy of BRAC, Ben de la Cruz and Toya Sarno Jordan/NPR hide caption

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Jason Beaubien/NPR, Courtesy of Malick Sidibe and Jack Shainman Gallery, Katherine Streeter for NPR, Maarten Boersema/APOPO, Gabriel Bouys/AFP/Getty Images, Courtesy of Max Wisshak, Courtesy of BRAC, Ben de la Cruz and Toya Sarno Jordan/NPR