Weekend Edition Saturday

NPR's Richard Harris talks with host Scott Simon about the Fukushima Dai-ichi reactors, one year after multiple meltdowns there spread radioactive materials across a swath of northern Japan. Huge technical challenges remain and prospects for resettling the area are uncertain.

NPR's Ari Shapiro traveled with presidential hopeful Mitt Romney this week as the campaign swung through Mississippi and Alabama ahead of Republican primaries this coming Tuesday.

Host Scott Simon reports on the other candidates for the Republican nomination for president: Rick Santorum, Newt Gingrich and Ron Paul. This week, they've been campaigning in the South and Midwest in the hunt for votes and nominating delegates.

Think of them as political mushrooms, popping up on yards and street corners across the country every campaign season. They are yards signs, blaring the names of candidates. But do they work? Host Scott Simon speaks with Costas Panagopoulos, professor of political science at Fordham University.

This time last year, Col. Moammar Gadhafi was losing control of Libya. Scott Simon talks with Abdel-Rahim el Keib, the Libyan interim prime minister who took over in the wake of the country's uprising.