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The latest threat to Mitt Romney's front-runner status in the Republican presidential field is Rick Santorum, who is tied with Romney in national polls. Ads from the Romney team define Santorum as a friend of K Street, but the former U.S. senator's conservative credentials may help him with Republican primary voters.

Dave Mustaine, the lead singer of Megadeth, says he was "completely oblivious" to Rick Santorum, but now likes the guy in the sweater vest. According to Rolling Stone, Mustaine dislikes Mitt Romney, and calls Newt Gingrich an "angry little man."

Ban Ki-moon said the Syrian government was using hospitals as torture centers and was abusing and chaining children as young as 10.

They show a rise in wealth connected to his work as a corporate consultant and media commentator.

The automaker announced Thursday that it earned its largest profit ever in 2011 — $7.6 billion — citing strong sales in the U.S. and China. The company nearly collapsed two years ago and needed a bailout by the U.S. government, which still owns about 26 percent of the company.

International pressure is building on Iran. On Wednesday, Iranian leaders claimed they made strides in their nuclear program and threatened to stop supplying oil to six European countries. Host Michel Martin hears what people inside the country think about the tensions. She speaks with writer Hooman Majd and human rights activist Sussan Tahmasebi.

NPR's Andy Carvin covered the uprising in Libya virtually, but now he'll see the country and its people in person.

China's economy sailed through the financial crisis unscathed — at least in the short run.

The findings mean pygmy goats join the ranks of humans, bats and whales as mammals with vocal plasticity.