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About one-third of black and Hispanic teens say they're online just about all the time, compared with about 1 in 5 whites, a new study says. Experts say smartphones are defining teens' social habits.

Leaders of the Western Hemisphere are wrapping up the Summit of the Americas. A meeting between President Obama and Cuban President Raul Castro has been the most anticipated moment of the conference.

NPR's Melissa Block interviews University of Pittsburgh law professor David Harris about the unusual charges against the six police officers involved in Freddie Gray's arrest.

NPR's Scott Simon and NPR's Tom Goldman chat about tonight's boxing match between Floyd Mayweather and Manny Pacquiao; the Kentucky Derby; and the NBA match-up between the Clippers and Spurs.

The outcomes of many medical procedures and treatments done in hospitals nationwide aren't tracked or even measured, says a surgeon who thinks that's bad. Understanding outcomes, he says, saves lives.

Efforts to replace air traffic control's aging radar-based system have been stuck in the Federal Aviation Administration's bureaucracy and lacked funding from Congress.

The Brazilian performer was a huge hit with American audiences who loved her outrageous costumes and beautiful voice. But she's been less appreciated in her homeland — until now.

In the 1930s, the Nazi movement was on the rise in Europe — and at summer camps for kids in the United States.

NPR's Melissa Block talks with Washington Post reporter Michael Fletcher about his experience as a reporter — and a black man — living in Baltimore for the past 30 years.

IBM's supercomputer has crushed Jeopardy! Now chefs are using Watson to come up with new kinds of recipes that work around dietary restrictions and other limitations.