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South Sudan's start as a new nation has been rocky. There are ethnic tensions at home and ongoing friction with Sudan, the previous ruler. The U.S. is trying to get the two Sudans talking more to each other.

The population of Montana just hit 1 million, but not all residents are celebrating. It's one of the least dense states in the nation, and they like it that way.

Republican presidential candidates are vying for the mantle of Reagan conservatism, but some observers say today's Republican Party is dramatically different than the one Ronald Reagan took charge of in the 1980s. So what exactly is a Reagan conservative? If he were alive, could Reagan still get the GOP nod?

Mice and rats are the most common lab animals. That's why some influential new guidelines on how to house mother rodents and their babies have created an uproar. Some experts at research centers say there's no evidence that making costly changes will really benefit the animals.

Iran has reportedly acknowledged receiving a letter from the U.S. about the Strait of Hormuz. Its contents weren't released. Iran's threatened to close off the waterway if sanctions are imposed against its oil sales. An Iranian news agency says the letter's being studied, and the government's determining whether to respond.

Dublin Dr. Pepper is made with pure cane sugar, and it's produced by Dr. Pepper Bottling Co. in Dublin, Texas. Dr. Pepper-Snapple Group sued. Now they've reached a deal: Dr. Pepper-Snapple bought the rights to sell and distribute the sugar-cane version in Texas.

Michelle Alexander says that many of the gains of the civil rights movement have been undermined by the mass incarceration of blacks in the war on drugs.

Former House Speaker Newt Gingrich has been so late to events that he's forced other speakers to stall. Rival Rick Santorum was at the same event on Friday, and he gladly used the time to work the crowd.

Two more shows to add to your 2012 list: Justified, which returns to FX Tuesday night for its third season, and Alcatraz, a new Fox drama and the latest from Lost producer J.J. Abrams. TV critic David Bianculli explains why they're both worth watching.

The nation celebrates the birthday of Martin Luther King Jr. on Monday. As millions honor his legacy with a national day of service, we take a moment to reflect on his legacy with the original "I Have a Dream" speech, delivered on August 28, 1963, on the steps of the Lincoln Memorial.