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Ultraviolet light can burn your skin and raise the risk for skin cancer. New research has helped uncover how the rays can weaken skin's outer layer, compromising its ability to protect the body.

What happens when you take a group of junior high kids from a school with a poverty level of more than 65 percent and teach them how to play chess? Katie Dellamaggiore's documentary, Brooklyn Castle, explores the amazing results.

This first presidential debate will focus on domestic issues, with the economy topping the list of homefront problems. Here are three economic terms likely to come up in the debate.

Eleven climbers, all scarred in some way by the wars in Iraq and Afghanistan, tackle a Himalayan climb in Michael Brown's documentary.

Could an actress and political activist with no electoral experience give the Senate's top Republican a race in very red Kentucky? It would be a long shot, say political experts, even though Judd has deep roots in the state, calling herself an "at least 8th generation Eastern Kentuckian."

The Obama administration is expected to ask for $50 billion to $60 billion. Top administrators told Congress Wednesday that they want at least some of that money to go toward preventing the kind of devastation caused by Sandy and other recent storms.

Reporting in the journal Biology Letters, Jeremy Goldbogen and colleagues say blue whales perform underwater acrobatics when they're eating: they rotate 360 degrees while they gulp krill. Reaching 90 feet in length, blue whales are the largest animals on the planet. Goldbogen is studying their dining habits to understand what fuels their growth.

Congress is considering whether to turn three top-secret sites involved with creating the atomic bomb into one of the country's most unusual national parks. Critics question the need for a park that celebrates nuclear weapons. Supporters say the park would ask tough questions about lessons learned.

Coal is poised to replace oil as the world's top energy source — possibly in the next five years, according to the International Energy Agency. The rise will be driven largely by growth in China and India, the IEA says, while the only large decline is seen coming in the United States.

The U.S.-China economic relationship is under pressure again with allegations from the House Intelligence Committee that two top Chinese telecom firms are security threats. China responded by saying the report could damage relations with the U.S.