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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.

Golf courses are water hogs, and that thirst is especially notable as California's drought grows in severity. At Pelican Hill, a top golf course near Los Angeles, water conservation is an obsession.

The story of the CNN debate reveals the challenge networks have faced in trying to squeeze 17 candidates into debates — and the folly of using polls to decide who will make it.

Rachel Martin talks tennis and the Australian Open with Mike Pesca, host of Slate's "The Gist."

Can teaching kids impulse control, self-evaluation and focus actually help them do better in school? Parents are paying top dollar for executive function coaches.

The man the U.S. alleges is the top al-Qaida operative who orchestrated the 1998 bombings of the U.S. embassies in Kenya and Tanzania has pleaded not guilty to the charges at a federal court in Manhattan. The case has brought the High Value Interrogation Group back into the spotlight. It was created by the Obama administration to extract valuable intelligence from terrorists, but national security experts say there have been too few cases to judge its promise.

Some of the greatest summer food experiences take you outside — from shucking corn and barbecuing to spitting watermelon seeds. Chef Bill Smith says his favorite summer memories took place at picnic tables over messy bowls of his grandmother's crab stew.

Decades ago, amid fears of rapid population growth, a biologist and an economist made a bet about how many people the planet could sustain. Global population is now estimated to top 7.1 billion. So who won the famous bet?