An estimated 1.7 million Cambodians were killed during the Khmer Rouge's reign of terror. As "Brother Number Three" in the leadership and foreign minister, Ieng Sary allegedly convinced many Cambodians who had fled to return. Then, many were allegedly tortured and executed.

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Adderall and other stimulant drugs help students stay focused, a benefit that hasn't been lost on people without ADHD. Now the nation's neurologists say children and teens shouldn't be be prescribed these drugs for "neuroenhancement."

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North Korea's threats have put the other countries in the region on edge. South Korea, Japan and China have a history of strained ties, but are united in wanting to restrain North Korea.

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Scientists have been searching for the elusive sub-atomic particle that gives everything mass. As more and more data come in from the Large Hadron Collider that straddles France and Switzerland, they think they've found it.

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This annual gathering of conservatives is the first since President Obama thwarted Republican efforts to retake the White House, a defeat of Mitt Romney that many in the GOP didn't see coming. And while there will be some backward glances, the conference is mostly about finding the way forward.

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In Herkimer, N.Y., people are puzzled about why 64-year-old Kurt Myers allegedly opened fire at two different locations. Thursday morning, after a 19-hour standoff, he was killed in a shootout with police.

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The pace of claims for unemployment insurance continues to be the lowest since January 2008. Meanwhile, higher energy costs pushed wholesale prices up sharply in February. But the upward pressure has since eased somewhat.

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The Venezuelan president died on March 5. But his body apparently wasn't prepared in time to allow for it to be placed in such a memorial. So Chávez's corpse likely won't be on view forever — like the bodies of Vladimir Lenin, Ho Chi Minh and Mao Zedong.

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Also: Advice on reading Vladimir Nabokov; fresh opportunities for Twitter poetry; and a new literary award.

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The first pope from the New World must now confront some old problems. He's begun his first full day as head of the church by slipping out of the Vatican to visit an ancient basilica. There, he quietly prayed with priests.

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Inside a courthouse in Steubenville, Ohio, a judge is considering whether a 16-year-old girl was so drunk that she couldn't consent to sex with two high school football players. Outside, the case continues to spawn debate over teen drinking, sex, football culture, and the ability of social media to amplify it all.

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Lawyers, prosecutors and judges across Massachusetts are sorting through thousands of cases that may now unravel. With a former chemist accused of falsifying more than 30,000 test results, hundreds of former defendants have already been released and police are bracing for an uptick in crime.

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From Chris Christie to Jeb Bush, a slew of potential candidates for president have been getting attention. Most of them are speaking this week at the Conservative Political Action Conference, but a few pointedly were not asked.

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His death came during a joint Cambodian-international trial on charges including crimes against humanity, war crimes and genocide. The Khmer Rouge regime, which ruled Cambodia from 1975 to 1979, was responsible for the deaths of an estimated 1.7 million people.

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Sheila Bair says it's too soon to celebrate over a housing recovery. Bair says a glut of houses could hit the market once prices perk up.

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After his election as pope Wednesday, Jorge Mario Bergoglio chose a name that, for many Catholics, sent an immediate signal of his goal to unite the Roman Catholic Church: Pope Francis. The name also prompted some confusion — over whether it should include "I."

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Pope Francis is the first pope from Latin America, a choice that makes sense strategically as the church becomes less Europe-centric. But how he will direct the church, which is still dealing with the fallout of the sexual abuse crisis and other challenges, remains unclear.

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One of the first personal tidbits to emerge about Pope Francis: He cooks for himself. But austerity and humility are two of the new pontiff's defining characteristics. And they seem to extend to his eating habits.

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Executives have recently focused attention on Silicon Valley's workplace culture. While companies like Google, Facebook and Yahoo operate by their own set of rules, what happens there may influence how many Americans work. The key components? Interactive learning and fun, one expert says.

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Researchers in France and the U.S. say watching a resuscitation attempt doesn't have lingering bad effects on relatives — it can actually be beneficial for them. But a researcher says there will be pushback on the practice from U.S. medical personnel because of their fear of being sued.

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