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Reporting inThe Lancet, researchers write that a preliminary study shows embryonic stem cell therapy in two patients with macular degeneration was safe. Results suggest the patients' vision improved slightly. Dr. Robert Lanza, Chief Scientific Officer of Advanced Cell Technology and co-author of the study, discusses the trial.

Director Joe Carnahan's new movie The Grey may appear to be about a group of guys beating up wolves. In fact, it's about how we live our lives, the choices we make, and the mistakes and regret that can stalk us all. Audie Cornish talks to Carnahan about the movie.

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.

In the wake of bombings that targeted churches, Christians are leaving the northern Nigerian city of Kano, a flash point of violence in recent years.

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.

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.

In his State of the Union address, President Obama called on every state to require students to stay in school until they graduate or turn 18. But unimpressive results in states that already have that requirement raise questions about how effective the initiative would really be.

As he campaigns for the Republican nomination, Newt Gingrich almost always works the name of Ronald Reagan into his speeches. In fact, Gingrich's name-dropping is so common that it's now being criticized by Mitt Romney and the superPAC that backs him.

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.

NBC's new drama plumbs the drama behind the curtain. The new series is the story of a Broadway musical — from the first idea, to auditions, rehearsals and the big premiere. The show's creator and executive producer says Smash has a universally appealing theme: the desire to pursue a dream.