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Discover the secret life of ice--what makes it cloudy or clear, why cracks form on ponds. Science Friday visited Queens ice sculptor Shintaro Okamoto in his studio and spoke with ice researcher Erland Schulson, of Dartmouth University, to find out why ice is an interesting subject for artists and scientists.

This week solar flares sent a huge blast of X-rays and charged particles screaming towards the Earth. Solar astronomer David Hathaway and physicist Doug Biesecker discuss the sun's explosive behavior, and how that 'space weather' affects satellites, airplanes and the electric grid.

Just two months after the International Atomic Energy Agency released a detailed report on Iran's nuclear program, the agency is headed back to Tehran. It plans to look into the highly sensitive question of whether Iran is doing nuclear weapons work.

Newt Gingrich laid out his case for an activist policy in Latin America, while Mitt Romney spoke warmly about the prospect of statehood for Puerto Rico.

Organizers say it's the first major parade for the men and women who fought in Iraq. They're hoping thousands turn out, just as people there did for the World Series champions last fall.

Tracy K. Smith is today's poet in residence at NPR's All Things Considered. She spent the day in the newsroom taking in the sights and sounds, and learning how the show comes together. Then she composed a poem about the day's headlines.

After his second-place finish in the South Carolina primary, Mitt Romney arrived in Florida armed with money and organization. With three days until the primary, Romney's recent debate performances and an endorsement from Puerto Rico's governor are part of his campaign's growing momentum.

Martin Mull and Fred Willard are comic partners in many minds. They helped create Fernwood Tonight in the late 1970s, and while they went on to solo careers in films and stage, they were reunited to play one of TV's first gay couples on Roseanne. Host Scott Simon sat down with the duo for the public television show Backstage With.

This week, Egyptians marked the first anniversary of the uprising that led to the ouster of President Hosni Mubarak. Deepening political divisions between pro-Islamist and secular protesters marred the event, erupting into violent scuffles. NPR's Soraya Sarhaddi Nelson reports.

This weekend, Cuban President Raul Castro will preside over the island's Communist Party conference. The meeting comes a week after Cuban dissident Wilmar Villar died following a hunger strike. Host Scott Simon talks with reporter Nick Miroff about the ongoing economic restructuring in Cuba and the new ways the country has been dealing with dissidents.