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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.

The 2014 Winter Olympics will unfold in a resort town on the relatively warm Black Sea — a testament to how far man-made snow has come in recent years.

At a news conference Tuesday, Toronto Mayor Rob Ford admitted he has smoked crack cocaine. Melissa Block talks to Jamie Strashin of the CBC for the latest.

Donald Trump continues to face lawsuits over his for-profit education company, Trump University. Trump accused federal judge Gonzalo Curiel of bias in one case, and said the judge, who is from Indiana, "happens to be, we believe, Mexican." NPR's Ari Shapiro talks to Washington Post political reporter Tom Hamburger about the case.

Secret tapes, street protests and political plots — Brazil is in turmoil and the newly installed government is already in trouble. It all centers on a corruption probe at the state oil company.

For two years, Majd Abdulghani kept a journal during a crossroads in her life: Should she get married or keep studying? Or can she do both?

Melissa Block talks with Gibran Peshimam, political editor for The Express Tribune in Karachi, about reaction in Pakistan to last week's American drone strike that killed the Pakistani Taliban leader.

AMC's The Walking Dead has key ratings better than network dramas. The show gets desirable young viewers by not skimping on explicit action, gore or storytelling. So why haven't the networks tried to imitate the show? Blame the FCC, which cracks down on explicit network broadcast content but overlooks cable.

Rachel Martin talks with Democratic Gov. John Hickenlooper of Colorado about what Democrats plan to do after Senate Republicans failed to pass their latest health care bill.