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Less than a year after they separated, Sudan and South Sudan are once again fighting. Both countries depend on oil revenue. A full-scale war could devastate their economies and trigger a humanitarian crisis.

Less than a year after they separated, Sudan and South Sudan are once again fighting. Both countries depend on oil revenue. A full-scale war could devastate their economies and trigger a humanitarian crisis.

Days ago, Boko Haram attacked a school in Nigeria, killing more than 50. As AP chief Africa correspondent Michelle Faul explains, the same group is thought responsible for a swath of recent violence.

Nkosi Johnson inspired millions in Africa and around the world to action in the fight against AIDS. The South African boy died of AIDS at age 12 is the subject of a new book by ABC newsman Jim Wooten, who says the boy's courage in the face of death was deeply moving.

Author Candice Millard argues that Churchill's battlefield coverage and daring escape from capture while serving as a correspondent for a British newspaper were turning points in his life.

Kenneth Kaunda spoke out about HIV when African leaders would not even acknowledge its existence. He sang about it, too, in a 2005 album that made a splash, then vanished. And so a search began.

Cuts and disruptions to the National Oceanic and Atmospheric Administration are affecting the nation's weather forecasts, potentially endangering people ahead of extreme weather season.

Toxins produced by algae that live in warm ocean waters can pass up the fish food chain. The toxins can sicken humans who eat large fish. A Florida study finds cases are underreported.

After several years planning the difficult mission, scientists successfully drilled through Antarctica's Pine Island Glacier. They were stunned by what they found, and worry global sea levels could be at risk.

Scientists say Typhoon Haiyan is one of the strongest ever recorded, though limited measurements may prevent them from declaring it as the record holder. Still, the storm was devastating: "We had a triple whammy of surge, very high winds and strong rainfall," says one climate scientist.