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Cancer is one of the most frightening diagnosis someone can get, but it might become less common. That's because the National Cancer Institute is asking the medical community to redefine what it calls cancer. Host Michel Martin finds out about the benefits and possible side effects.

Politicians who were caught up in sex scandals have often achieved second careers in media and lobbying. Now, some want to return to elective office.

At a White House news conference, the president was asked about Syria, the Boston Marathon bombings, new gun laws, the Guantanamo Bay detention center and other subjects. He made the case that despite some setbacks, he'll still get some important things done in his second term.

A study of mine blast victims finds further evidence that there's a resurgence of black lung among coal miners. The relatively young ages of some of the miners and their limited tenure underground suggests significant exposure to coal dust.

Dan Buettner visited some of the happiest populations on Earth to figure out what makes them tick. After five years of study, he argues the real keys to happiness lie not in wealth or beauty, but in fundamental changes to the way we live. Buettner lays out his findings in his book Thrive.

In a new book, The Anatomy of Violence, Adrian Raine argues that violent behavior has a biological basis just like depression or schizophrenia. This raises questions about treatment, accountability and punishment, including the death penalty.

Envelopes sent to a senator and President Obama contained a substance that initially tested positive for ricin.

FBI and SWAT teams are trying to locate a suspect in Monday's bombing at the Boston Marathon. The other suspect, his brother, was killed earlier in a shootout with police. Dr. David Schoenfeld of Beth Israel Hospital talks about Thursday night's police action in Watertown.

U.S. reconstruction teams have spent a decade building roads, bridges and other pieces of infrastructure that are badly needed in Afghanistan. But now the international effort is winding down, and it's not clear how much the Afghans will be able to do on their own.

Almost 50 years ago, a small group of families started a movement to demand an accounting of the nation's POW/MIAs. They changed the way America thinks about its servicemen and women lost at war.