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The motivation for flying with other birds in V formation is probably to save energy, say researchers who tracked the pattern of wing flaps in an ibis flock. Each bird in the V catches a bit of lift from the bird ahead.

Alice McKennis has a metal plate and 11 screws in her leg after breaking it in 30 places in March. She's had other injuries before that, but she says it gives her an edge over the competition. "To make the Olympics is extremely hard," she says, "so it takes a certain kind of toughness."

This super cold air is usually whirling around the Arctic. But a big piece has plunged further south than normal. One way to think about what's happening: If a spinning ice skater extends her arms, she slows down. Sometimes, she wobbles and falls. The polar vortex has sort of stretched out an arm.

The first satellite ever developed by high school students to make it to space is believed to be orbiting Earth after getting a ride aboard a U.S. military rocket Tuesday night from Wallops Island, Va. Fittingly, perhaps, you can send it a text message.

McDonald's USA President Jeff Stratton has been criticized on social media for his videotaped response to an employee who confronted him and complained that she doesn't make enough to feed her kids. But a spokeswoman for the company says McDonald's has a long history of promoting from within.

Secretary of Defense Chuck Hagel returned to the Mideast on Monday after a weekend tour of Afghanistan and a stop in Pakistan. The trip focused on a planned security deal with Afghanistan and concerns among Gulf allies about a nuclear deal with Iran.

Chefs and school cafeteria directors say burgers that blend mushrooms and meat are a hit. Mushroom-meat burgers are, on average, 24 percent lower in fat and 27 percent cheaper than regular, all-beef burgers, according to the Mushroom Council.

Charlie Trotter was one of the country's most influential chefs. His death comes just a year after he closed his namesake restaurant in Chicago. Authorities plan to conduct an autopsy on Wednesday.

Concerns in Europe over a slowdown in economic growth have been rattling global financial markets. NPR's Scott Simon talks with correspondent John Ydstie about the volatile week on Wall Street.

All around the country, drivers are seeing signs that gas prices are depressed. Those drops helped hold down the latest consumer price index. But economists worry about too much of a good thing.