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People are often told to walk 10,000 steps a day to be healthy. But if your goal is to avoid being crippled by knee arthritis, just 6,000 a day will to it, a study finds. And 3,000 is a good start.

Before Cesar Millan became a TV personality, he was a homeless, undocumented immigrant from Mexico with a dream. He reveals how his career took off as part of NPR's series, "My Big Break."

A California judge ruled that the state's teacher tenure laws are unconstitutional because they disproportionately affect poor and/or minority students. Education Week's Stephen Sawchuk explains.

Public health officials have dreamed of getting cigarette use down to 16 percent of teens, and that day has come. But some are turning to hookahs and electronic cigarettes, so the news isn't all good.

Call it revenge of the nerds. Popularity at age 13 fades by age 22, a study finds. And kids who try to act cool in their early teens are more likely to have alcohol and relationship problems later.

The former executive editor of The New York Times, whose sudden dismissal sent shock waves through the media world, will teach undergraduate courses on narrative nonfiction.

If you have a capable device, no more cords or outlets required to charge your smartphone — not at Starbucks locations, anyway.

A shift in power is underway in Iraq, where the jihadi group ISIS has captured several cities in a recent offensive. Jane Arraf is a reporter for Al Jazeera America, and she comments on the violence.

The accident that seriously injured comic Tracy Morgan and killed another comedian has focused attention on truck driving safety. New regulations limited the amount of overnights truckers could work, but the trucking industry and its congressional allies are trying to roll back the limits.

Grave questions face the Iraqi government, and U.S. officials are scrambling to decide what to do. The U.S. helped shape the country; is there anything it can — or would — do to keep it together?