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Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.

Former Pennsylvania Sen. Rick Santorum is looking for momentum as Republicans caucus and vote in three states on Tuesday: Missouri, Minnesota and Colorado. And dissatisfaction with front-runner Mitt Romney in Missouri could point to a potential opportunity for President Obama in the fall.

Roughly half of Facebook's users check in on smartphones and other mobile devices every month, but so far the company isn't making money on mobile. That's one of the potential pitfalls for the company as it prepares to sell its stock to the public.

The Obama administration and the president's Chicago-based re-election campaign are trying to minimize the risks of offending teachers and union members by carefully navigating the tricky waters between Mayor Rahm Emanuel and the striking teachers.

A study of online conversation finds some big differences in geographically distinct parts of Florida around the issue of unemployment. This kind of information could be important to President Obama and Mitt Romney in how they shape their messages while visiting the state, and in advertisements.

Three one-act plays recently performed in Beirut are based on the actual words of Syrians. The show was performed in a bunkerlike space to replicate the conditions artists making such work endure. The actress could not be named. A TV series also takes on Syrian politics — Top Goon is an ensemble of finger puppets who lampoon President Bashar Assad. The filmmakers are also anonymous. To be caught with one of these puppets might be worse than being caught with a stinger missile.

The framers of the Constitution didn't spell out all the responsibilities of the speaker of the House. In practice, one of those duties has been engaging in one-on-one negotiations with a president on important policy issues. But John Boehner says no more — even with new fiscal fights looming.

Republicans want to raise revenue by closing loopholes in the tax code instead of by raising rates. But tax breaks like the charitable deduction and the mortgage interest deduction come with interest groups willing to fight tooth and nail for them.

Critic David Edelstein reviews a film that may sound a lot like a campus-bound version of Glee, but has more to it than that label might suggest.

American symphonies have just begun a new season — but many musicians around the country have yet to play a single note on stage.