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To understand how social rules affect the interactions between humans and machines, scientists re-created a famous psychology experiment using robots. What they found is that if robots are nice to us, we're nice to them. If they're not, we "punish" them.

Stanley Karnow, one of the greats of American journalism, died on Sunday at the age of 87. He was a correspondent for Time Magazine and The Washington Post.

A lawmaker in Washington State has proposed a way to make extra money: sell corporate naming rights to public buildings. It already happens with sports venues: the Mariners play at Safeco Field.

More than 230 people died. Many were overcome by fumes. Others couldn't get out because the exit wasn't large enough. In the confusion, about 50 victims may have thought a bathroom door was a way out.

A 30-day state of emergency and some curfews have not stopped protesters from returning to the streets. Meanwhile, a leading opposition group says it won't take part in President Mohammed Morsi's "national dialogue" until he agrees to some reforms.

The European Free Trade Association decided Iceland did not break the law when it decided not to cover the losses of foreigners invested in a failed Icelandic bank.

A sociologist argues in a new book that framing obesity as a public health crisis takes a heavy social toll. She says big bodies should be embraced as a form of human diversity, and not seen automatically as a sign of sickness.

Nearly 13 million people head to work as temporary and contract employees each year, according to the American Staffing Association. In an opinion piece for The New York Times, sociologist Erin Hatton argues that it's time to get rid of the "anti-worker ideology that has come to accompany it."

Responding to tightened sanctions and a new United Nations Security Council resolution condemning their December rocket launch, North Korea has threatened a new nuclear test, explicitly warning that the North Korean weapons program will target the United States.

The national debate over gun laws has taken on urgency since last year's shootings at an elementary school in Connecticut and a movie theater in Colorado. Giffords, who was shot in January 2011, is adding her voice. At a Senate hearing, all sides made their cases.