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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.

Documents show that chronic electrical problems at the NSA's mammoth new data center in Utah destroyed equipment and delayed the center's opening, according to reports.

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.

Speaker John Boehner issued a direct challenge to President Obama, saying history is on the side of Republicans. Dozens of other times, Boehner said, government funding has been used as leverage, and it will not be different this time around.

A small number of staff are working to make sure the plants, which include many exotic and unusual specimens, stay healthy, says a facility manager.

Scientists who do research in Antarctica have just learned that the shutdown will effectively cancel all of their planned fieldwork on the icy continent this year. All research activities not essential to human safety and the preservation of property will be stopped.

Sexual violence appears to have roots in adolescence, so researchers asked teenagers and young adults if they'd ever forced someone to have sexual activity against their will. About 1 in 10 had. Psychological pressure was the most common tactic.

Nearly a year's worth of rain was dumped on parts of the state in four days this fall. The downpour from the heavens created a slurry on the mountainsides that scrubbed away soil, trees, boulders and buildings. Scientists say the flooding may have been a once-in-a-thousand-years event.

The composer's tendency to push buttons won him harsh reviews — and a lasting legacy. Conductor John Mauceri discusses how Giuseppe Verdi was regarded during his lifetime and where he stands now, 200 years after his birth.

President Obama called House Speaker John Boehner in the morning but there was no breakthrough. Both later held news conferences to reiterate their positions.