The medical community has reason for cautious optimism in fighting the Ebola virus in Democratic Republic of the Congo: A new vaccine has been created since the 2014 West Africa outbreak. Frederick Murphy/Centers for Disease Control and Prevention via AP hide caption

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Frederick Murphy/Centers for Disease Control and Prevention via AP

Close-up of tzoallis being made during a summer nutrition workshop held by Puente a la Salud, a group based in Oaxaca, Mexico, that is helping to push an amaranth comeback. An ancient Aztec staple, tzoallis are made of amaranth and corn flour, agave honey and amaranth cereal. Courtesy of Puente a la Salud Comunitaria hide caption

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Courtesy of Puente a la Salud Comunitaria

Fishermen in Papua New Guinea, living on their boats, wait for the tide to change before going out to fish. Tuberculosis is a major health threat in the Pacific Ocean nation. Jason South/The AGE/Fairfax Media via Getty Images hide caption

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Jason South/The AGE/Fairfax Media via Getty Images

Zubair, who was diagnosed with a bone tumor and had part of his leg amputated, uses morphine to manage his pain. "Because of morphine I am surviving," he says. With the pain relief, he can ride his motorbike and work at a coffee shop. Screengrab from "Using Morphine To Stay Alive" hide caption

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Screengrab from "Using Morphine To Stay Alive"

A girl carries a child in the outskirts of Lilongwe, the capital of Malawi. That's one of the countries in sub-Saharan Africa that has made good progress in reducing child mortality. Aris Messinis/AFP/Getty Images hide caption

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Aris Messinis/AFP/Getty Images

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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From left: A scene from the video of a car crash test; illustration of a mosquito transmitting the Zika virus; a menstrual shed in Nepal. Insurance Institute for Highway Safety/YouTube; BSIP/UIG via Getty Images; Poulomi Basu/Magnum Emergency Fund hide caption

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Insurance Institute for Highway Safety/YouTube; BSIP/UIG via Getty Images; Poulomi Basu/Magnum Emergency Fund