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The warning was raised to "severe," the second-highest level, as British Prime Minister David Cameron said Islamic extremism poses a "greater and deeper" threat to the U.K. than ever before.

The top source of vanilla beans sends its fragrant crop abroad for processing into extract. Now a former Peace Corps volunteer aims to boost Madagascar's economy by building a bean-to-bottle business.

You probably haven't thought about whether your phone could help diagnose alcohol withdrawal. Well, it can. An app for doctors measures tremors and may help tell if someone's faking it to get drugs.

Networks like the Discovery Channel have been criticized for pushing entertainment at the cost of science, with fake "documentaries" about everything from mermaids to mythical monster sharks.

School districts are beginning to cope with the recent influx of new students from Central America. Many have little education and most are just beginning to learn English.

Iran has announced that it is providing weapons to Kurdish forces to fight the Islamic State. Linda Wertheimer talks to Karim Sadjadpour of the Carnegie Endowment for International Peace.

Liberia is the country hardest hit by the Ebola virus outbreak. Aid is trickling in, but it is not enough. NPR's Linda Wertheimer speaks to Wall Street Journal reporter Drew Hinshaw in the capital, Monrovia.

China's legislature is limiting reforms in Hong Kong, drawing battle lines in what opposition groups warned would be clashing visions of the political future of the region and of China.

Militant fighters are crossing into Syria through Turkey and public criticism of Turkey is growing louder. NPR's Linda Wertheimer talks to the Financial Times' Istanbul correspondent, Daniel Dombey.

The town of Amerli, which includes some 20,000 Shiite Turkmen, has been surrounded by Sunni Islamic State fighters for two months.