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Scientists are studying the way we show complex emotions. It turns out we're better at it than was previously thought, mixing and matching basic expressions with sophistication — and consistency.

Will Chicago Mayor Rahm Emanuel, a former top aide to President Obama, find himself facing a challenge from another politician who was once close to Obama?

The oil giant BP has reached an $18.7 billion settlement with Gulf states and the federal government over the 2010 oil spill in the Gulf of Mexico — the worst in U.S. history.

The three Americans and a British man who took down a heavily armed man on a passenger train speeding through Belgium have received France's top honor.

What happens when shopping malls die? Often they're turning into medical centers, churches, schools and universities and new suburban downtowns.

The mayor of Iguala and his wife, accused of being connected to the disappearance of 43 students, are now fugitives. Thousands of protesters marched in Mexico City demanding justice.

Loretta Lynch is the lead federal prosecutor in a district of 8 million people. But outside law enforcement circles, she isn't widely known. She'd be the nation's first black female attorney general.

A top French investigator said they hope to have "rough ideas in a matter of days" as to why Germanwings Flight 4U 9525 crashed in the French Alps Tuesday, killing all 150 people onboard.

The system, a pair of robotic arms, learned to cook by mimicking the motions of a top chef. Even though it can't smell or taste, its maker says the robot should be able to make 2,000 meals by 2017.

In a powerful monarchy known for its aged leaders, Saudi Arabia's King Salman announced his heirs to the throne. NPR's Rachel Martin speaks to correspondent Deborah Amos.