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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.

It will start drawing on Web browsing data to determine what ads users see, while allowing them to edit their own data profiles. Privacy advocates say the changes put too much burden on consumers.

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."

The actress who starred with Sidney Poitier in the 1961 classic A Raisin in the Sun died Wednesday. She was nominated for a best supporting actress Oscar for her work in American Gangster.

U.S. Army Sgt. Bowe Bergdahl, held hostage for five years in Afghanistan, has arrived at Brooke Army Medical Center in San Antonio.

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.

Clinton's new memoir, Hard Choices, outlines her four years as secretary of state under President Obama. She talks about her vote for the Iraq War, women's rights and political "gamers."

Facebook will use members' Web browsing habits to help advertisers target their ads more effectively. Facebook also announced a feature that allows users to see why targeted ads are coming their way.

There's a presumption in the business world that everyone's straight, says John Browne, who hid his homosexuality for years. In his new book, he says it's time for a change in corporate culture.

Moscow has been talking lately about "color revolutions" as a new form of warfare employed by the West. The name comes from the Orange and Rose Revolutions in Ukraine and Georgia, respectively, but it's now being applied to popular rebellions such as those in Egypt and Syria. While Russia accuses the West of this kind of subversion, it seems to be following the same playbook in eastern Ukraine.