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As Iran is set to hold nuclear talks with world powers, the Obama administration is working to convince senators to hold off on additional sanctions. And on Tuesday, voters across the country will go to the polls to elect mayors, governors and other officials.

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.

Some analysts say that Nintendo's days are numbered because sales of its new console, Wii U, have been lackluster. But since Nintendo still offers some of the most popular game franchises, the love of Zelda and Mario may keep the company going for a long time.

A drop in the numbers of fierce beasts worldwide might seem like good news for deer and antelope. But expanding herds of grass-eaters leave stream banks naked and vulnerable to erosion, and can even change the stream's course, according to scientists calling for more protection of large predators.

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 New Jersey governor has said neither he nor his staff were involved in the closing of some key lanes leading onto the George Washington Bridge into New York. Democrats have said the governor's office may have been trying to punish the mayor of Fort Lee, N.J., for not supporting Christie's re-election bid.

"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.

Every year, the world's movers and shakers gather in Davos, for an economic conference. Renee Montagne talks to Gideon Rachman, the chief foreign affairs columnist for the Financial Times, about who's there, and what international issues are at the forefront.

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.