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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.

In 1996, Wallace's novel Infinite Jest was a critical and popular success. The new movie The End of The Tour recreates the author's tour for that book. Originally broadcast March 5, 1997.

U.S. Immigration and Customs Enforcement (ICE) says the suspects are believed to have been involved in torture and aiding regimes that carried out ethnic cleansing.

NPR's Robert Siegel speaks with Julie Rehmeyer, a contributing editor at Discover magazine, about a newly discovered pentagon.

Democratic Sen. Sherrod Brown gave U.S. trade officials until Friday to allow staffers full access to the trade deal draft. The deadline passed, and now he is threatening to hold up an Obama nominee.

Too often the developing world is depicted as a place of poverty and suffering. Photos from the contest offer a different vision.

A restaurant in Toronto dives deep into centuries-old recipes to re-imagine what native Canadian cuisine means. It's part of a movement among chefs exploring heritage and identity through food.

Cynthia Hawkins leads a family business that endured the 1965 Watts riots, and the Rodney King riots in 1992. She praises the embattled neighborhood, and says strong community ties brought success.

Under a new partnership between HBO and Sesame Street, PBS stations will screen new episodes of the children's show nine months after they appear on HBO. NPR's Scott Simon talks to media correspondent David Folkenflik.

Two murders in California are stoking debate about undocumented immigrants and how state and local authorities cooperate — or don't — with federal officials.