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An experimental technique called optogenetics is starting to change the way researchers look at the brain. The tool allows them to switch entire brain circuits on and off using light, and may help figure out what's going wrong in brain ailments from epilepsy to depression.

As the U.S. economy continues to recover, it has been getting some help from an unexpected place. After decades of massive job losses, manufacturing firms have been steadily creating jobs — many of them well-paying. One particularly bright spot is a new generation of high-tech manufacturers.

The Federal Aviation Administration is under pressure to come up with rules for the commercial use of drones. The central issue: How can they fly safely in the same airspace as other aircraft?

This week marked a new step in Michelle Obama's evolution as first lady. In her hometown of Chicago, she delivered one of the most emotional speeches of her career. Obama almost never ventures into the top political controversy of the day, but her role may be changing.

After years of recession and rampant tax evasion, the U.S. territory is desperate to renegotiate its $73 billion debt. But it can't declare bankruptcy, and plans to raise taxes face strong resistance.