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There was a time — a time long, long ago — when MySpace dominated the teen social-media world. Not anymore. NPR's Sami Yenigun looks at how teenagers use various social platforms in today's increasingly segmented online universe.

Scientists and parents have long been baffled by the fact that children with autism often don't pay attention to human voices. Researchers say that may be because speech doesn't activate a reward system in the brain for those children the way it does for typical children.

An enterprising carpenter and a creative puppeteer teamed up on a do-it-yourself project to build a mechanical hand for a little boy. They created an inexpensive prosthetic and published their designs on the Internet. So far, over 100 children have been outfitted.

The Arab Spring countries are still in the process of remaking themselves. Consider Libya, where militia fighters continue to roam the streets, yet a new private radio station does not hesitate to criticize the armed groups.

President Obama says federal judges have been "overseeing" the recently exposed government surveillance programs. But few, if any, experts in the Bush or Obama administrations believe that the Foreign Intelligence Surveillance Court has the enforcement teeth it once had.

A fresh study looks at what happens after people change their meat-eating habits. Those who upped their intake — about 3.5 servings more per week — saw their risk of developing Type 2 diabetes during four years of follow-up increase by almost 50 percent.

The first-ever study of more than 1,100 schools of education released Tuesday by the National Council on Teacher Quality shows that teacher preparation is in disarray. The study warns that 163 programs provide only "minimal, substandard training."

The anonymous book sculptor of Edinburgh strikes again; the childhood drawings of E.E. Cummings; Jonathan Franzen on literary sexism.

To celebrate Laura Grambel's college graduation, her mom ordered a cake: Indiana red and white, with a photo of Laura's face. One more request: a graduation cap, made of icing. Instead, the baker drew a cat on Laura's head

In Rio de Janeiro, more than 100,000 people filled the streets calling on the government to concentrate on them and not on international events.