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The move isn't as severe as the one taken earlier this month by S&P, because it leaves France's rating intact. The credit of Italy and Spain, however, was knocked down two notches.

Dengue fever cases are soaring worldwide, according to the World Health Organization. They're also hitting closer to home. Two locally acquired cases were reported in Miami last year, and public health experts say we should expect more.

In his book, Reinventing Discovery: The New Era of Networked Science, Physicist Michael Nielsen discusses why scientists jealously guard their data and are slow to adopt online tools for collaboration. Nielsen talks about why attempts to create science wikipedias have failed.

A 33,000-year-old skull of a "wolf on the way to becoming a dog" was found in a Siberian cave. Evolutionary Biologist Susan Crockford, co-author of a study about the skull in PLoS ONE, discusses why the discovery challenges common beliefs about dog domestication.

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.

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 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.

Mitt Romney offered a vigorous defense Thursday night of Massachusetts' decision to mandate that nearly every resident either have health insurance or pay a tax penalty. In fact, some say it was the best defense of the individual mandate made by any candidate — including the president — so far this election cycle.

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.

Cuban food has evolved very little since Fidel Castro came into power — the U.S. embargo has made it hard to import ingredients from abroad and few citizens have been permitted to travel. But a handful of Cuban chefs, including one who recently visited Washington, D.C., is determined to modernize the cuisine.