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One of only four known northern white rhinoceroses was euthanized at the San Diego Zoo Safari Park on Sunday.

By assessing the strength of certain connections in the brain with an MRI test, researchers were often able to tell whether children and adolescents had attention deficit hyperactivity disorder.

About 15 percent of people in prison are infected with hepatitis C. Screening and treating inmates would save $750 million over 30 years and prevent many new cases in the general public.

We asked NPR listeners what they'd like to know about women's health in midlife. Hundreds of you had questions on topics from hormones to chin hairs. Two doctors are giving us the answers.

The procedure is rapidly going mainstream, but it's so new that it's impossible to know if these women will exercise their option to have a child. Also, live birth rates from frozen eggs remain low.

More than half of America's sweet potatoes were lifted by hand from the soil of North Carolina. It's some of the most back-breaking farm work to be found, and migrant laborers do most of it.

Turkey said the plane violated its airspace and that it had issued 10 warnings before firing. Russian President Vladimir Putin said the downing was a "stab in the back by the terrorists' accomplices."

In the early 20th century, Americans wore gaudy costumes and bizarre masks, and some roved the streets begging for candy and treats — at Thanksgiving time.

During a papal visit, the media swarm and security is intense. He speaks of issues that face the country. After he goes, is there any lasting legacy?

Laquan McDonald was shot 16 times in October 2014, after he refused to follow officers' instructions as he walked down a street with a knife. The officer who shot him has been charged with murder.