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They could shoot up to 24,000 feet and maintain that altitude in a long-distance migration across the Himalayas. But it's more efficient for bar-headed geese to soar and dive, scientists find.

The New York Police Department is one of the most sophisticated in the world, with advanced systems for fighting crime. But it's not so good at policing its own officers, criminal justice experts say.

Police in France have ended both of the hostage sieges they were facing in and near Paris. Three gunmen are dead, along with four of the hostages.

Melissa Block speaks with our regular political commentators, E.J. Dionne, of the Washington Post and Brookings Institution and David Brooks, of the New York Times. They discuss the new Congress, Keystone XL Pipeline votes and terror in Paris.

Former CIA employee Jeffrey Sterling goes to trial next week on charges he violated his oath and leaked confidential information to reporter James Risen.

The U.S. House passed legislation to approve the pipeline on Friday and the Senate is expected to take up the issue in coming weeks. President Obama has threatened a veto. In the meantime, a legal challenge over the route the pipeline would take through Nebraska has been resolved — for now.

A Paris neighborhood found itself at the center of a violent stand-off on Friday, with shoppers taken hostage at a local supermarket

Robert Siegel talks to Paris-based terrorism and security expert Jean-Charles Brisard about the terrorist cell in France known as the Buttes-Chaumont network.

But William Bratton tells NPR the issue was being corrected. The death of Eric Garner in police custody and the subsequent slaying of two New York City police officers has created a tense atmosphere.

House Republicans voted this week to change the way Congress measures the effects of tax and spending bills.