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Rick Perry garnered instant front-runner status in some polls when he joined the GOP presidential race. But he slid to the back of the pack after embarrassing debate performances. All along, his bid for the nomination seemed outsize. So, too, were the expectations, which ended Thursday.

Newt Gingrich has beaten Mitt Romney in South Carolina. The question now becomes whether he can pull off that trick enough times in enough states to deny Romney the Republican presidential nomination.

NPR got a rare behind-the-scenes look at the CIA's Open Source Center, where research analysts troll social media for a new kind of secret — those hiding in plain sight. Nowadays, CIA analysts are also under more pressure to identify potential crises, with as little as a tweet or a status update to go on.

This unprecedented partnership between egg producers and animal welfare advocates is asking Congress to pass a law that's supposed to improve the lives of egg-laying hens with new and improved cages. If passed, it would be the first federal law that takes into account the emotional lives of farm animals.

Newt Gingrich and Mitt Romney are redoubling their efforts to appeal to the Republican Party's base, which ranges from somewhat to very conservative. To do so, they are sounding conservative themes that may boost their chances to win GOP primaries but could harm their ability to beat President Obama.

Last semester, Stanford University professors tried something radically new: They opened their classes to the world for free. Within hours, thousands had signed up to participate. The classes' success could transform the way we look at higher education.

Mitt Romney's campaign charged President Obama with weakening work requirements for welfare recipients by offering waivers to the law. But Obama's campaign says that, as Massachusetts governor, Romney requested waivers as well.

Guest host Linda Wertheimer discusses Mitt Romney's selection for vice president with Washington Post columnist E.J. Dionne and contributing editor for the Weekly Standard Matthew Continetti.

Michael Phelps leaves London with 18 gold medals and a record 22 total medals. He says that his plans for life after the Olympics include visiting some of the cities he's competed in — but outside the bubble of swim meets, for a change.

Most states have improved their general-election voting procedures since the Bush-Gore Florida recount in 2000. But judging from the stumbles this campaign season, the political parties that run caucuses didn't get the memo. Three states hold Republican caucuses on Super Tuesday.