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Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

A protest in the Russian Arctic has dramatized growing problems with oil drilling there. Every country has a stake in the enormously lucrative search for oil and gas in the Arctic, says professor Lawton Brigham. But pollution from reckless attempts at development are evident on an island near the Polar circle.

The revelations about U.S. intercepts of terrorist communications might have been intended to reassure the public about the government's vigilance. But they also might have been about providing political cover.

Morning Edition reports on the music that sustained Nelson Mandela and other members of the anti-apartheid movement while they were in a South African prison. Many of them were huge reggae fans.

Archaeologists are now mapping a wall in eastern China that is as much as 15 feet tall in some places, and predates the more famous barrier by 300 years. Hundreds of miles long, it was likely erected to keep neighboring Chinese dynasties from invading each other, historians say.

Republican presidential candidate Mitt Romney has shied away from TV interviews. But on Friday, he sat down for five interviews with the nation's top TV news outlets. Romney says he shouldn't be held responsible for what Bain did after 1999 because he had already left the company to run the Salt Lake City Olympics

Just a week after President Obama announced a significant policy shift on immigration, Latino leaders from across the country gathered in Orlando. Both Obama and his GOP rival for the White House, Mitt Romney, addressed the group this week, as NPR's Scott Horlsey reports.

Former Minnesota Gov. Tim Pawlenty is the son of a truck driver, an evangelical Christian, a former presidential candidate, and for months now a loyal surrogate for Republican Mitt Romney. He's also considered a top contender to become Romney's pick for vice president.

The 2008 GOP presidential nominee came to the defense of Hilary Clinton's longtime aide on the Senate floor. While Sen. John McCain didn't mention Rep. Michele Bachmann by name, he made clear he wants her to stop suggesting the aide is helping the Muslim Brotherhood.

China's consumer market is massive, and breaking in isn't easy. Some U.S. products have struggled. But in recent years, an old American sneaker has become an unlikely success story: the Converse Chuck Taylor All Star.