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People with osteoarthritis in their knees aren't getting much exercise, a new study finds, even though exercise actually helps reduce pain and stiffness and can prevent future disability. So how to get moving if you've got arthritis? Try walking and swimming, doctors say.

When Staci Freeman and her sister Jami Valentine first took in a child ravaged by war in Afghanistan last year, Arefa was a 6-year-old in Hello Kitty shoes, who quickly turned the daily routine of changing her head bandages into a counting game.

In the world of atoms, one thing can exist in two places at once. But on a larger scale, that rule usually breaks down. For the first time, scientists have put an object large enough to be seen with the naked eye into a state where it exhibits "weird" quantum behavior.

Kicking Ass With Less Style And Substance

An Army specialist deployed in Afghanistan has started taking male hormones to begin her transition from female to male. The transgender female, who asked to be called "Keith," is hiding her identity but telling her story to give inspiration to others in the military.

The cost of the program is too high, leaders say, and these days, an email or tweet can quickly share information that pages used to physically carry around the chambers. But pages have been a House fixture since its inception, and many are sad to see the chance to witness history go away.

Moore Is Less

Federal prosecutors say former San Diego mayor Maureen O'Connor gambled away millions of dollars.

Across the country, newly formed task forces made up of local, state and federal law enforcement officers are starting to view what was once seen as run-of-the-mill prostitution as possible instances of sex trafficking.

To cope with the hard times, millions of families have pulled together — stacking two, three, even four generations on top of one another. An NPR series explores the lives of three multigenerational households struggling with issues of money, duty and love.