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The Los Alamos National Laboratory in New Mexico places 15 employees on mandatory leave as the FBI investigates the disappearance of two data storage devices containing classified information. The incident raises questions over the balance between protecting top secret research at the nuclear weapons lab and scientists who value working unhindered by elaborate security measures. NPR's David Kestenbaum reports.

A top State Department official wants to unleash the power of Twitter, Facebook and other services to crowdsource the fight to control the world's nuclear weapons.

Marisa Peñaloza is a senior producer on NPR's National Desk. Peñaloza's productions are among the signature pieces heard on NPR's award-winning newsmagazines Morning Edition and All Things Considered, as well as weekend shows. Her work has covered a wide array of topics — from breaking news to feature stories, as well as investigative reports.

Sometimes our eyes are just drawn to the top of a list. Using a regular e-mail of headlines sent out to economists, a study found the ones listed higher get read more — and cited more in future work.

"I can't forgive this," St. Louis native Andy Cohen says on his Bravo show, noting that St. Louis recently topped The Wall Street Journal's list of America's top sports cities.

The candidates clashed over war, gender and health care with less than three weeks to go before the first votes in the Democratic presidential nominating fight.

The shooting at a Tops grocery store, which authorities say was motivated by racist hate, brought into sharper focus the weight of being a target.

This week marked a new step in Michelle Obama's evolution as first lady. In her hometown of Chicago, she delivered one of the most emotional speeches of her career. Obama almost never ventures into the top political controversy of the day, but her role may be changing.

B. Todd Jones, the top federal prosecutor in Minnesota, has been tapped as acting director of the agency, which is under pressure from Congress after a botched gun-trafficking operation known as "Fast and Furious." A colleague says of Jones, "When the going gets tough, he can be one of the toughest guys in the room."

Maj. Gen. Ivan Popov said Russia's military leadership was angered by his frank talk about challenges faced by his forces, particularly the shortage of equipment that resulted in Russian casualties.