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The contaminants researchers found at the bottom of Alberta lakes are from air pollutants coming from tar sands oil production and processing facilities. The pollution wasn't picked up by the industry-funded monitoring program that was supposed to track environmental risks from tar sands over recent decades.

Payments to farmers survived in the latest extension of the farm bill. But not all of the groups that argued for the end of the subsidies see this as a loss. They've just been given nine more months to make their case to Congress.

The Arizona city's gun buyback program is being challenged by the National Rifle Association. The gun rights group says it is illegal under the state's law to destroy the guns, and warned the city it will sue. Tucson officials say they are not violating the law.

The Mississippi River is at historically low levels. The Army Corps of Engineers says the river will likely be able to stay open through the month, but soon it may be too shallow in parts for barge traffic. There have been calls for the corps to release water from reservoirs along the Mississippi.

Psy took YouTube by storm with the viral sensation "Gangnam Style." He will appear in a Super Bowl ad for Wonderful Pistachios — one of the biggest processors of the nuts. The commercial will include an alternate version of Psy's hit song.

Blanco, a first-generation Cuban-American, says he identifies with the theme of the inauguration: Our People, Our Future. He is the fifth poet to take part in a U.S. presidential inauguration, and also the youngest. He says being selected was a "great honor."

Students of Don Gillett at Wrightsville Elementary in York., Pa., are in a program tracking books they read. If they total 2,000, he says he'll get a tent and a grill, and live on the roof for awhile.

With the economy on the brink of disaster, American taxpayers bailed out the insurance giant. Now, its former CEO is leading a lawsuit that claims shareholders didn't get fair compensation. But the threat of a public backlash may have kept AIG from joining the suit.

Along the de facto border in contested Kashmir, a Pakistani soldier was killed Sunday. On Tuesday, two Indian soldiers were killed and there are reports that one was beheaded.

The Emancipation Proclamation celebrates its 150th anniversary this year. But not everyone knows the real story behind the document. Host Michel Martin speaks with historian Lonnie Bunch, about what the Emancipation Proclamation did - and didn't do.