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You think it's cold? You ain't seen nothing! Imagine what it's like at science's coldest places: from the Eastern Antarctic Plateau to the moons of Saturn to the coldest labs.

The coldest temperatures in years and gusty winds that blasted the Midwest are expected to travel as far south as Brownsville, Texas, and Central Florida. The arctic air has caused temperatures to drop 20 to 40 degrees below average in several states and forced businesses and schools to close.

Colorado's retailers may be allowed to sell marijuana but under federal law, the state's banks cannot knowingly do business with them. This has forced marijuana merchants in the state to operate almost solely in cash.

A wild final 4 1/2 minutes was capped by Florida State's winning touchdown that came with just 13 seconds left in the game. So the much-debated Bowl Championship Series system ends with a great game.

A dominant downhill skier, Vonn has been trying to recover from a knee injury. "But the reality has sunk in that my knee is just too unstable to compete at this level," she announced Tuesday.

Could a little red circle help you skip the comfort food this winter and maybe drop a few pounds? Doctors from Massachusetts General Hospital think so. They put traffic-light labels on their cafeteria's menu to signal the healthfulness of dishes. The colorful cues helped improve eating habits even two years later.

Confusion has surrounded the departure of a group of Greek Orthodox nuns from a convent north of Damascus earlier this month. Syrian officials say radical Islamist rebels kidnapped the nuns at gunpoint. But a rebel leader who was there says the nuns' convent was under fire from government forces.

The former Massachusetts Republican senator's monthslong flirtation with Granite State voters has powered plenty of speculation, and Thursday's event only fanned it.

The president will be taking questions from reporters. Listen to what he has to say and read highlights.

Janet Yellen would be the first woman to head the central bank. On Friday, the Senate voted to head off any potential filibuster of her nomination. A confirmation vote is scheduled for Jan. 6.