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Los Angeles chef Roy Choi helped launch the food truck movement. Now he wants to blend high and low cuisine to combat food deserts. He's challenging the tyranny of junk food in the inner cities, and is pushing other chefs to think about how they can contribute to food justice in their communities.

Peter Higgs just won a Nobel Prize for his research on a theory involving a particle that bears his name. How did that come to be? The unexpected answer came in the mail 16 years ago.

Bombs targeting polio vaccinators have threatened the global effort to stamp out the disease once and for all. The attacks are likely to continue, researchers warned, unless there's a change in eradication strategy toward local action.

Explorers Eddy Cartaya and Brent McGregor have used ropes, ice screws, wet suits, and flashlights to map out more than a mile of passages underneath a glacier on Oregon's Mount Hood, in what are thought to be America's largest known glacier caves outside Alaska.

One big reason for the division in Washington is the growing divide between different kinds of voters back home.

An officer was hurt by shattered glass when a gunman fired 15 to 20 rounds into a federal building in West Virginia. Authorities are still trying to determine a motive.

More than 1 million high school boys play football in the U.S. With a growing body of evidence linking the sport with chronic brain injury, some schools are trying to change how teams play and practice — but they have a long way to go.

When politicians say that small businesses are key to job growth, what most people imagine are mom-and-pop shops — the dry cleaner or coffee place. It may make a good sound bite, but research shows that most small businesses stay small. Only a fraction of these do grow into something big.

On the bicentennial of the composer's birth, his music seems keenly suited to our triumphs and our failures. His operas may star dukes, prostitutes or court jesters, but they are all packed with vital insights into human nature.

Whatever happens to a the global economy, one thing is clear: If the U.S. defaults, people all over the world who have loaned the government money won't get paid on time.