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David Greene speaks with NPR's Don Gonyea, Scott Horsley and Brian Naylor about The Des Moines Register's Great Bicycle Ride Across Iowa. The three reporters are riding in the event, also known as RAGBRAI, to explore the Iowa they didn't see on the presidential campaign trail.

Previous estimates of the climate-warming gas were based on the rough number of methane-emitting sources on the ground — such as factories, refineries, stoves, swamps, landfills and cattle herds. But by directly measuring levels of methane in the air instead, a new study puts the total much higher.

It's rivalry week in college football. And this weekend, there's some extra spice as games from Alabama to Florida to Michigan could have an impact on which two teams end up playing for the national championship.

"When we pull back the curtain now, the mess is disturbing," says House Energy and Commerce Committee Chairman Fred Upton, R-Mich., of the latest revelations. These documents call into question whether contractors can fix the website as promised by the end of November.

A California teen, the FBI says, flew from San Jose to Maui inside the landing gear bay of a Boeing 767. He is said to be OK. He's also very lucky. Nearly everyone else who's tried has died.

One year ago, a factory building in Bangladesh collapsed, killing more than 1,100 workers. Top retailers have begun inspecting factories more aggressively, but other steps have fallen short.

On Tuesday, voters in six states head to the polls for primary elections. NPR's Charles Mahtesian gives NPR's Lynn Neary a preview of what to expect.

Economists say too much income inequality is a bad thing. But they also say some inequality is necessary, and even good for society. Here are suggestions for finding that balance.

Sherpas have a great reputation as the world's best climbers. But when something goes wrong up in the mountains, it deeply affects the small ethnic group and its communities around the world.

Israel and Hamas have agreed on a cease-fire, which raises hopes of an end to the seven-week war in Gaza that has killed more than 2,000 people.