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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.

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.

Agents at the Bureau of Alcohol, Tobacco, Firearms and Explosives have spent months testing new plastic weapons, and report that the guns can be lethal and hard to detect. The findings come just as a federal law that requires guns to be composed of at least some metal to help people in schools and airports detect them is set to expire.

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.

The Federal Reserve has released transcripts from more than a dozen meetings that took place in 2008, as Fed officials and other regulators struggled to get on top of an unfolding crisis.

The Food and Drug Administration and the White House are expected to unveil a new food label this week. Changed just once since their adoption, these labels need to be less confusing, advocates say.

Steve Inskeep talks to Syrian journalist Obadah Al-Kaddri about being named one of Time magazine's top 100 influential people. Al-Kaddri is director of Radio Watan, a pirate station heard in Syria.

During the 2012 presidential race, Democrats used big data to much success. The big data approach to micro-targeting voters is getting increasingly powerful, and is being used for midterm campaigns.

The U.S. wants Europe to enforce economic sanctions against Russia over its push into Ukraine, but the Pentagon itself is reluctant to stop trading with Moscow.

Prompted by calls for violence on the radio, South Sudanese rebels have slaughtered hundreds of civilians. Melissa Block speaks with UN representative in South Sudan, Toby Lanzer.