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Acute flaccid myelitis causes weakness in arms or legs. The cause isn't clear but may be related to viruses, environmental toxins or genetic disorders. Since 2014, 386 total cases have been confirmed.

To design a "moral machine," researchers updated a classic thought experiment for the autonomous vehicle age. But do we really want artificial intelligence making decisions on who lives or dies?

The move by Theresa May, aimed at strengthening global partnerships post-Brexit, will mark a fundamental shift in focus from short-term poverty reduction to long-term economic growth.

After a Supreme Court ruling, cities began exploring ways to restrict panhandlers. Critics claim laws criminalize poverty, while proponents say they would help boost economic development downtown.

Iranians contacted by NPR are losing income and looking for who's at fault as U.S. sanctions start to bite.

Richard Overton enlisted in an all-black battalion, serving in Iwo Jima and Okinawa. He loved ice cream, whiskey and cigars. "Today we mourn not just a hero, but a legend," the U.S. Army said.

In Brazil, evangelical Christians have made inroads into the Catholic community with innovations like drive-through prayer centers and massive outreach fairs featuring popular pastors and pop stars. In a nation long dominated by Catholics, about 22 percent of Brazilians now identify as evangelical.

The FBI is interested in two men seen in videos and photographs at Monday's Boston Marathon before two bombs went off. Investigators released photographs and asked the public to help identify the men on Thursday. Robert Siegel talks to Dina Temple-Raston has the latest.

In the East African nation of Kenya, voters are choosing the next president. Of greatest concern is whether these polls will provoke the same amount of deadly ethnic violence as the elections five years ago. More than 1,000 people were killed during voting in that election.

Brazil's largest city is more about business than art. But a new crop of creators — who work in media as different as crochet, graffiti and poetry — is trying to change that by sprucing up public spaces.