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President Obama capped a five-day trip to Kenya and Ethiopia by becoming the first sitting American president to address the African Union.

In a speech intended for the entire continent and delivered from the AU headquarters in Addis Ababa, Ethiopia, Obama called on African leaders to create jobs and foster democracy. NPR's Gregory Warner reports that Obama spoke of Africa's bright future and called on leaders to end corruption and political intimidation.

Gregory filed this report:

Twitter has started taking down jokes for copyright infringement. The removals were first spotted by @PlagiarismBad, which traced the takedown notices to Olga Lexell, a freelance writer in Los Angeles.

During a meeting with all 27 members of the North Atlantic Treaty Organization on Tuesday, Turkey said it wanted to give the members a heads up that at some point it may need their help fighting against the self-declared Islamic State.

Turkey called a rare Article 4 meeting of the NATO allies after it began an air campaign against ISIS targets in Syria.

Cancer patients who do rehabilitation before they begin treatment may recover more quickly from surgery, chemotherapy or radiation, some cancer specialists say. But insurance coverage for cancer prehabilitation, as it's called, can be spotty, especially if the aim is to prevent problems rather than treat existing ones.

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