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Reporting in the journal Nature Communications,researchers write that they were able to track down the cells causing clogged arteries. Dr. Jill Helms, co-author on the study, discusses why stem cells are to blame and how the study could lead to more effective treatments.

The military judge also indicated she would delay the start of Bradley Manning's trial to November or January.

SpaceX's Dragon capsule has travelled safely to the International Space Station and back. The next step, says Space.com writer Clara Moskowitz, is to outfit the capsule for crew, which SpaceX hopes to complete by 2015. Until then US astronauts will hitch rides on Russia's Soyuz, at about $60 million a pop.

One of few women in a musical movement dominated by men, Pauline Black helped lead the 1970s U.K. ska revival with her band The Selecter. She discusses her complicated family history in a new memoir, Black by Design.

Niagara Falls has long been a magnet for daredevils, but strict laws have kept them away for more than a century. That changes this Friday, when circus performer Nik Wallenda will walk a two-inch-thick wire across the giant waterfall. It's an exception officials hope will rescue tourism — and the city's economy.

For a stark example of the depth of the European economic crisis, consider the job prospects of young Spaniards. Nearly 50 percent are out of work, making it extremely difficult for many to move out of their parents' home, start a career or get married.

Gorillas often get a bad rap, but folks who work with them say they're as much gentle as giant. On a recent trip to scope out the primates, an NPR producer trekked into the Virunga mountains of East Africa, where more than half of the world's mountain gorillas live.

Weekend Edition Saturday host Scott Simon talks with Phil Hadad and Marybeth Ledesma, the creators of a new website called the Museum of Endangered Sounds. Their aim is to preserve the noises of obsolete gadgets.

On a rare visit to Syria, Deb Amos talks with Weekend Edition Saturday host Scott Simon about the 15-month old conflict and the mood in the Syrian capital.

For Mad Men actor Jared Harris, who portrayed Lane Pryce on the AMC drama, Sydney Pollack's comedy Tootsie is a film that he never gets tired of watching. "It's inspiring," Harris says.