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America's top general is in Afghanistan, in part to discuss how to stop the "green on blue" attacks that have left 10 U.S. military personnel dead in just the past two weeks. One step that's already been taken: Armed coalition soldiers are now watching their Afghan counterparts during missions.

The U.S. Air Force's top officer, Gen. Norton Schwartz, is retiring after four years on the job. Schwartz was a champion of remotely piloted aircraft, or drones. But he says the Air Force will continue to need pilots for decades and more manned aircraft to ensure it can prevail with a minimum use of force.

GOP presidential candidate Mitt Romney's choice of Rep. Paul Ryan as his running mate seems to be uniting both Republicans and Democrats. Here's a quick look at the pluses and minuses of the decision, from the point of view of the man at the top of the ticket.

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.

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.

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.

Though he went on to a string of Top 40 solo hits, Art Garfunkel is still best known as half of a legendary duo. With the release of a new retrospective, which covers his work from Simon & Garfunkel's heyday through the present, Garfunkel says he's looking for some long-overdue credit.

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.

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.

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."