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North Korea confirmed on Tuesday that it had successfully conducted a third nuclear test. It's an important step toward North Korea's goal of building a bomb small enough to be fitted on a missile that could reach United States.

As the renewed debate over immigration reform unfolds in Washington, thousands of undocumented immigrants still try to cross the border with Mexico. A…

Host Michel Martin continues the conversation about why boys fall behind in school. She speaks with a group of parents and experts: author Christina Hoff Sommers, New York University education professor Pedro Noguera, University of Virginia Dean Bob Pianta, and Glenn Ivey, father of five boys.

Without a deal by March 1, across-the-board federal spending cuts will kick in — including deep cuts to the nation's defense budget. Michele Flournoy, former undersecretary of defense for policy, and NPR's Tom Bowman discuss what sequestration might mean for the U.S. military.

A study of more than 85,000 women in Norway found that those who started taking a folic acid supplement four weeks before getting pregnant were about 40 percent less likely to have a child who developed the disorder. Mothers had to continue taking the supplement during the first eight weeks of pregnancy to get the full benefit.

North Korea's latest nuclear weapons test is much more powerful than the previous two, according to estimates made by instruments that measure seismic waves from the blast. But it's hard to verify North Korea's claim that the test was of a miniaturized nuclear weapon.

Mandolinist Mike Compton will travel from Nashville, Tennessee to perform Saturday evening at the Cooper's Glen Music Festival. The festival takes place…

Kirk Siegler talks to Melissa Block for an update on the search for former Los Angeles Police Department officer Christopher Dorner. A man that authorities identified as Dorner was holed up in a cabin near Big Bear Lake, Calif., on Tuesday evening. Hundreds of officers surrounded the home. Dorner is wanted for questioning in three murders and one attempted murder.

Last month, Brent Musburger was accused of being sexist when he gushed about "what a beautiful woman" Miss Alabama was during the BCS Championship game. Commentator Frank Deford says if Musburger was guilty of anything, it was failing to note what a cliche he was perpetuating.

John David, 73, is one of the many faces of a growing group of Americans: seniors who work. The former TV producer switched careers in his 50s, becoming a fitness instructor. "This turned out to be the real calling," he says.