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An Afghan working on an installation shared by Afghan and foreign forces shot and killed three NATO soldiers on Friday — raising to six the number of international troops killed by their Afghan partners in 24 hours, officials said.

All summer long, Weekend Edition has been sampling the sounds of America's street musicians. The latest to catch our ear is Alexis Dawdy, a young violinist who returned to her hometown of Lansing, Mich., to study at Michigan State University — and do a little busking on the side.

"I'm actually not a music major. This is really a hobby that accidentally became a profession," Dawdy says. "I'm studying linguistics, and I'm 17 credits out from graduation. My goal is to do it debt-free, and this helps a lot. This pays for books and this pays for food."

Carmelita Jeter made sure everyone understood what Team USA had just accomplished. She pointed toward the digital clock with the baton as it flashed a time of 40.82 seconds.

Jeter, Tianna Madison, Allyson Felix and Bianca Knight had just gotten a gold medal in the 4 X 100m relay and they did so while shattering the world record by a little more than half a second.

The London Summer Olympics are winding down, and by most accounts, the games have been a success. There were plenty of "thrill of victory, agony of defeat" moments; big, enthusiastic crowds — although there were too many blocks of empty seats; and for those who like a helping of scandal served up at their Olympics, there was that, too.

It wasn't the usual scourge of doping. Instead, the London Olympics had incidents of bending the rules and ethics of sport.

After serving as speaker of the House, publishing several historical novels and running for president, what's next for Newt Gingrich?

One possible third act, Gingrich told NPR staffers on Friday, could be sharing a television studio with his wife, Callista.

"We're kind of intrigued with the idea of doing a daily show, which would change our lives pretty dramatically," Gingrich said. "But if we do it, we want it to be closer to Regis and Kathie Lee than to Bill O'Reilly or Hardball."