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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.

Secretary of State Antony Blinken and his British counterpart David Lammy are raising alarms about Iranian ballistic missiles in Russia that threaten Ukraine.

As protestors clash with some 3,000 federal immigration agents in the Twin Cities, we look at the legal issues with law professor Emmanuel Mauleón and Brennan Center for Justice's Elizabeth Goitein.

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 iconic Volkswagen van goes out of production this month in Brazil because of new government-imposed safety requirements. Some of the last of the hippy buses are now rolling off the line.

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.

Children automatically get dental coverage through Affordable Care Act policies, and adults can buy dental insurance if they wish. That's one of the big changes under the health care law. And everyone has until March 31 to buy insurance and avoid penalties.

The Obama administration just released the latest sign-up numbers for its troubled health insurance exchange website. Enrollment picked up last month, after a disastrous start in October. Still, the number of people signing up for coverage is below the administration's original forecasts.