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Boosting ventilation and filtration not only lowers the risk of transmission, it's also linked to higher test scores and better health. But making upgrades is more complex than it sounds.

Two consecutive years of escalating gun violence and homicides leave big cities and small towns reeling as they search for ways to regain control of a problem with many causes.

It's a tableau of biblical proportions, from the Nativity scene, to the tomb of Jesus, to the site of Mary's annunciation. Replicas of Christian shrines are on display at a Franciscan Monastery in Washington, D.C. NPR's Jacki Lyden visits Holy Land of America.

Sixteen horses have been put to death since May after injuries suffered at Arlington Park, a racetrack in suburban Chicago. Consultants have investigated and the track's surface has been adjusted. A debate lingers over why so many horses are breaking down.

Making English the official language has been one of the hottest flashpoints in the U.S. immigration debate. Univision news anchor Jorge Ramos says Spanish is already the primary language in many communities around the country amid a "demographic revolution."

Fossils found in northern China show that some of the first birds on Earth lived on the water. The exquisitely preserved fossils, resembling modern ducks or loons, lived 110 million years ago, when many forms of today' animals started to take shape.

The noodle-obsessed chef's Momofuku chain has converted many New Yorkers to his brand of anything-but-instant ramen. Now Chang brings his recipe to the world in a new cookbook, Momofuku.

Minnesota's fastest-growing population consists of people 65 and older -- a reflection of a national trend. Many of the state's elderly are staying active and healthy longer, ditching retirement to head back to work in large numbers -- and exploding myths about what it means to grow old. Annie Baxter of Minnesota Public Radio reports.

The FDA has confirmed the nation is experiencing a shortage of Adderall after many pharmacies around the country have been unable to fill prescriptions and keep up with demand.

The Federal Reserve lowered a key interest rate on Tuesday by three-quarters of a percentage point, a hefty cut that nonetheless was smaller than many analysts had expected. The federal funds rate now stands at 2.25 percent, the lowest since February 2005. It makes it easier for consumers and businesses to borrow money.