Some of the more than 30,000 Nuer civilians sheltering in a United Nations base in South Sudan's capital Juba for fear of targeted killings by government forces walk by an armored vehicle and a watchtower manned by Chinese peacekeepers. Jason Patinkin/AP hide caption

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Somali soldiers stand guard next to wreckage from a car bomb outside the U.N.'s office in Mogadishu on Tuesday. At least 13 people were killed in twin bombings near U.N. and African Union buildings adjoining Mogadishu's airport, police said, in what the jihadist al-Shabab group claimed as a suicide attack. Mohamed Abdiwahab/AFP/Getty Images hide caption

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Every day, hundreds of patients wait to be seen at the Munhava health center in Mozambique's port city of Beira. Morgana Wingard hide caption

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The Sole Doctor In The Hospital Shoulders The Burden Of HIV

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Woman holding the dapivirine vaginal ring. Andrew Loxley/International Partnership for Microbicides hide caption

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The HIV Trap: A Woman's Lack Of Control

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Zimbabwean President Robert Mugabe delivers the keynote address during Zimbabwe's 36th Independence Day celebrations in February in Harare. Tsvangirayi Mukwazhi/AP hide caption

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By hanging a caged chicken near mosquito traps in bedrooms in three Ethiopian villages, researchers hoped to learn how the insects react to the scent of a fowl. Kassahun Jaleta/Courtesy of Rickard Ignell hide caption

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Catherine Msimango, 18, takes a nightly pill to protect her against HIV. "It's all about my safety," says the South African high schooler. Jason Beaubien/NPR hide caption

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Why Healthy Teens Are Taking A Daily Anti-AIDS Pill

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A soldier of the United Nations mission to Mali stands guard near a UN vehicle after it drove over an explosive device near Kidal, northern Mali, on July 14. Souleymane Ag Anara/AFP/Getty Images hide caption

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Grains, beads and bangles unearthed from dig sites in Banda, Ghana, tell of a time when droughts did not bring famine. (Above) Archaeologists Amanda Logan and Osei Kofi dig into the floor of a house from the 1500s. Courtesy of Ann Stahl/Northwestern University hide caption

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Facebook Blamed For Flare-Up In Fighting In South Sudan

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