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Pressure cooker bombs have long been used in places such as Afghanistan and Pakistan because they are cheap, easy to build and inconspicuous. They rely on basic principles of physics to amplify their explosive power.

Top overall seed Louisville will face Wichita State at the Georgia Dome next Saturday, while Michigan takes on Syracuse in the other national semifinal. The winners advance to the April 8 championship.

An Egyptian court has sentenced 21 defendants to death over a deadly soccer riot last year, adding fuel to the violent protests that continued to flare across the country on Saturday.

Twenty years ago, Italian food was regarded as cheap, peasant food. Now it's served on menus worldwide and considered to be one of the healthiest cuisines. Esquire Magazine's food critic John Mariani chronicles the story of pizza, macaroni and red sauce in How Italian Food Conquered the World.

On April 18, 1981, two minor league teams met for an early season game of no real consequence. It would go down in history as one of the most extraordinary games ever.

Tesla CEO Elon Musk has made some bold moves in his first day leading Twitter.

The Senate GOP leader told NPR in an interview that nothing he heard in a secret briefing changed his mind about the integrity of the Russia and Justice Department probes. "I support both," he said.

Republican presidential candidate Ben Carson says he never applied to West Point, although in his book, he had written that he was "offered a full scholarship" to the elite military academy.

Significant aftershocks continue to rock Chile two days after a magnitude 8.8 earthquake brought down buildings and bridges, and triggered a tsunami. And yet it's already clear the devastation won't reach the levels seen in Haiti. Walter Mooney, a seismologist with the U.S. Geological Survey, explains the differences between the two quakes.

A report from the Bipartisan Policy Center suggests that seniors should start paying more for Medicare to help the nation's deficit. It also wants the government to check the growth of both Medicare and Medicaid programs in the future.