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It's hard for anyone to get enough of the sunshine vitamin in the wintry North, and dark-skinned teens may be especially prone to a deficiency, doctors find. A weekly supplement can help.

The U.S. and China are the world's two largest polluters, but the will to do something about climate change is lower in both than in the rest of the world. In the U.S., there's a party split.

Hospitals have averted many types of injuries where clear preventive steps have been identified. But complications with less clear-cut solutions remain a problem, a government report finds.

NPR's Robert Siegel interviews Chuck Wexler, executive director of the Police Executive Research Forum, about how police departments around the country are trained to respond to active shooting situations.

A decrease in PSA testing came after a controversial recommendation against routine screening. As a result, many fewer cases of the most common cancer to hit men are being diagnosed, research finds.

The Drinkable Book has water filters in each page. Tear out a page, pour dirty water over it and bacteria will be killed. But is this the best way to clean up the developing world's water supply?

Approved by voters last year, Proposition 47 lets people with some nonviolent felonies petition to reduce their crimes to misdemeanors. It's giving former offenders access to better opportunities.

Before the U.S. Open, the Nike and Gatorade sponsorships and the fame, Venus and Serena Williams were taking their first swings on tennis courts in Compton, Calif. It's a source of pride in the city.

People in the American Southwest and Mexican Northwest were drinking cacao and tea-like yaupon in places where neither grew. That suggests an extensive trade network to deliver a caffeine fix.

Along with his band The Night Sweats, Rateliff is the voice behind "S.O.B." — a new song with an old sound that's catching a lot of people off guard.