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The ongoing European debt crisis is expected to pose major challenges to the next U.S. administration.

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.

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.

Venezuelan officials say their president Hugo Chavez remains in a "delicate" condition in a Havana hospital following his fourth cancer surgery. If Chavez cannot be sworn in to a new presidential term on Jan. 10, a process of selecting a new president will begin. How well prepared is the U.S. government is for a post-Chavez Venezuela?

Since the assault weapons ban passed in the mid-1990s, Congress has had little appetite for gun control measures. "I think it was a very different time in 1994. I don't think there's very many lessons to learn from that," says Ted Kaufman, who was then-Sen. Joe Biden's chief of staff.

South African Oscar Pistorius will run on artificial legs in the 400-meter Olympic sprint preliminaries in London Saturday. Pistorius is a double amputee who runs world-class times on his carbon-fiber limbs. Some question whether he has an unfair edge — so a lab studied his running motion.

If you can't develop a real rooting interest in the Super Bowl, perhaps you can come up with something almost completely arbitrary to help you care.

The Queen of Versailles documents the rise and fall of David and Jackie Siegel, who lost their billions in the recession while building the biggest house in the U.S. Director Lauren Greenfield spoke to NPR about the film — and how the Siegels are an allegory for the overreaching of America.