Kamala in front of her menstruation shed. Jane Greenhalgh/NPR hide caption

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Soccer buddies Lahis Maria Ramos Veras, 14 (left), and Milena Medeiros dos Santos, 16, don't let taunts keep them from playing. Lahis goes by the nickname "Lala." Lianne Milton for NPR hide caption

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Tatenda Yemeke spent the summer working on mental health issues in Cape Town: "I lived with a Muslim family and they helped me learn about local culture." Courtesy of Tatenda Yemeke hide caption

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Pauline Cafferkey is now in isolation at the Royal Free Hospital in North London, where she was treated in January for Ebola. Justin Tallis/AFP/Getty Images hide caption

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When Dr. Boie Jalloh got the call to join the fight against Ebola in Sierra Leone, his friends told him he'd be crazy to sign on. It's a good thing he didn't listen. Aurelie Marrier Dunienville for NPR hide caption

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A policeman detains a suspected member of the MS-13 gang at a checkpoint in San Salvador during a ban on public transport imposed by the gangs. Encarni Pindado for NPR hide caption

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Black mambas are one of the fastest snakes in the world and grow up to 14 feet long. But their venom is no match for the antidote Fav-Afrique. Balint Porneczi/Bloomberg/Getty Images hide caption

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Goats and Soda

The World Is Running Out Of A Critical Snakebite Antidote

If a venomous snake bites you in Africa, you're likely to survive when you're near a hospital. That might not be the case next year.

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A long legacy in global health: Former President Jimmy Carter has worked to end neglected diseases since 1982. Here he sits with former South African President Nelson Mandela at a ceremony in Soweto, celebrating a new AIDS project in 2002. AFP/Getty Images hide caption

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A celebration erupts in the streets of the Massessehbeh village on Friday, after President Ernest Bai Koroma officially ended Sierra Leone's largest remaining Ebola quarantine. Sunday Alamba/AP hide caption

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The PharmaChk is a bit like a litmus test for drugs: You pop in a pill at one end, and in 15 minutes, a number appears on a screen telling you the drug's potency. Mahafreen H. Mistry/NPR hide caption

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A woman receives the rVSV-ZEBOV Ebola vaccine at a clinical trial in Conakry, Guinea. The vaccine appears effective after only one shot. Cellou Binani/AFP/Getty Images hide caption

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Slum dwellers near Calcutta get their water from a municipal pipe. Water coming out of the tap on the left is for bathing and so is untreated. The blue Zimba chlorinator is hooked up to the tap on the right, which is used for drinking water. Courtesy of Suprio Das/Zimba hide caption

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A family receives treatment for cholera at a clinic run by Doctors Without Borders in Port-au-Prince, Haiti, in October 2011, a year after the overwhelming outbreak began. Ramon Espinosa/AP hide caption

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Russia has strict rules on dispensing painkillers. Family members say some cancer patients killed themselves because they could not obtain the medicine and the pain was too great. Andy Baker/Ikon Images/Getty Images hide caption

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