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Republican presidential candidates are taking part in a forum in Columbia, South Carolina, today. Among the panelists asking questions will be Senator — and Tea Party favorite — Jim DeMint.

The U.S. was once a magnet for particle physicists, but Europe's Large Hadron Collider is now the biggest show around. As the Tevatron prepares to go dark in September, questions remain about the next step in U.S. physics research.

After nine weeks reporting on the progress of Libyan rebels, NPR's Lourdes Garcia-Navarro reflects on the state of the country. She says to come into the capital Tripoli with rebel forces was one of the "most extraordinary things" she's been able to do.

Postmaster General Patrick Donahoe appears before Senators Tuesday — a few days after the U.S. Postal Service announced it may not be able to make a multi-billion dollar payment next week, and could run out money entirely by next year.

Several new websites connect travelers, who are looking to save money, with homeowners who have a spare room. Airbnb is one of the fastest growing of these rental-by-owner sites. But as with other fast-growing businesses, it faces several challenges.

President Obama is trying to rally public support for the jobs program he'll spell out to Congress later this week. At a Labor Day rally in Detroit Monday, Obama offered a sneak preview of parts of the plan. Labor leaders said they're encouraged by the president's new-found aggressiveness on the jobs front.

Jason Schneider makes his living selling jokes for a $1 a pop in New York's Central Park, according to the New York Daily News. The 26 year old came to New York about four years ago, and couldn't find a permanent job. So earlier this year he started telling jokes in the park.

The president's address Thursday night — in which he'll lay out his latest proposals for boosting job growth — comes as his approval ratings hit new lows.

Thanks to the satellite transmitter that was attached to the penguin, his progress can be followed on the Web. The little guy was found on a beach in New Zealand earlier this year.

The 9-11 did not simply target the World Trade Center and the Pentagon. Nationwide, the threat was real. In Kentucky, southern governors who were here for…