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For decades, we have known of only 14 convex pentagons that can do something called "tiling the plane." Now there is a 15th shape, but mathematicians are still far from knowing exactly how many exist.

Europe is dealing with its largest wave of displaced people since World War II — a quarter million migrants just this year. NPR's Rachel Martin gets the numbers from correspondent Ari Shapiro.

With Europe-bound migrants dying in the sea crossing, NPR's Rachel Martin hears about rescue operations from Lindis Hurum, emergency coordinator for Doctors Without Borders on the ship Bourbon Argos.

Two soldiers are poised to become the first women to pass Army Ranger training. NPR's Rachel Martin interviews Christian Science Monitor reporter Anna Mulrine, who witnessed their grueling tests.

New York Times correspondent Andrew Kramer tells NPR's Rachel Martin why Russian authorities are burning hundreds of tons of food and how a nation that suffered wartime starvation is reacting.

The NBA superstar's brand is one of many mired in copyright trouble in China. An unrelated shoe company with an Air Jordan-esque name and logo is making millions — and under Chinese law, it's legal.

The hurricane virtually flattened the entire town, destroying or damaging nearly every home. Rebuilding efforts took another hit in 2010 with the BP oil spill.

The charity has said it wants to "lead the effort in transparency." But when a congressman requested an inquiry into its disaster relief work, Red Cross officials wanted it called off.

Developers at Akili are working on a game they hope might one day be prescribed to treat mental health conditions like ADHD and depression. But first, they must get past the FDA.

The Trigana Air Service turboprop plane was carrying 54 people as well as $468,750 in cash intended as fuel aid for poor families.