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As people age, caps called telomeres on the ends of their chromosomes shrink. The observation has led some scientists to argue the shortening is not only a marker of aging but a fundamental driver of it.

Ectromagnetic theory says there should be a bit of matter that is unipolar: neither north or south. So far no one has found a magnetic monopole, but physicists at Amherst college have come close.

Aloe Blacc sang two of the past year's most ubiquitous singles. So why haven't you heard of him?

Activists who organized around the Trayvon Martin case are trying to marshal the energy to take on "stand your ground" laws. It's likely to be an especially difficult challenge.

Colonel Mustard, in the ballroom, with the ... Gouda? You may not expect a wheel of cheese to be at the center of a devious plot, but Michael Paterniti's The Telling Room manages to do just that.

Polling shows that many Americans aren't quite sure how the Affordable Care Act will affect them, and it may be even more confusing for immigrants and people who don't speak English as their first language. Illinois has a large immigrant population, and the state has been working to resolve language barriers as it gets ready to launch its insurance marketplace.

Director Alfonso Cuaron puts you in orbit with novice astronaut Sandra Bullock and veteran-on-his-last-mission George Clooney as their space shuttle gets demolished by debris from an exploded Soviet satellite. Critic David Edelstein says that you should watch this movie on the biggest screen you can find.

It's a busy day in Sochi: At the rink, the Russian men's hockey team was knocked out and the U.S. men's team faces the Czech Republic, while at the track, the U.S. women hope to medal in bobsledding.

The last big games of the Olympics, including the gold medal hockey game and four-man bobsled, concluded Sunday. After the closing ceremony, thousands headed for Sochi's tiny airport. NPR's Robert Smith provides a roundup of highlights.

What a week in Sochi, Russia! NPR's Scott Simon speaks with Olympics correspondent Tamara Keith about the ill-fated opening ceremony, stray dogs and bad hotel rooms, as well as who won the first gold medal.