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There have been nagging questions about whether nitrous oxide during surgery raises the risk of heart attacks and other problems. Now, there's some reassurance, though no definitive answer, from a study that looked at the widely used anesthetic.

David Greene speaks with NPR's Nina Totenberg about the Supreme Court's landmark decision granting federal benefits to married same-sex couples.

Labor-starved farmers are now eyeing lettuce-picking robots to help with the harvest. But more robots on the farm could also spell trouble for smaller producers that can't afford them.

The U.S. executive of a Chinese factory was prevented by workers from leaving the facility following a decision to shut down part of the business and move the some jobs to India where wages are lower. The story shows how widespread labor-related strife is in the world's most populous nation, and how the bottom line dictates where jobs go.

First there was Rusty, the red panda. Now there are reports that a bear was captured in Washington, D.C., Wednesday, prompting (mostly unserious) concerns of a possible ursine siege on the nation's capital.

Gross domestic product expanded at a rate of 1.8 percent in the first quarter, down from the 2.4 percent pace previously reported.

In its latest effort to rein in the country's vibrant social media, Turkey says it has requested cooperation from Twitter and Facebook; they're not playing ball. Protesters are embracing social media — and the government has complained that such outlets won't share user data with law enforcement.

The world has been thumbing its nose at the U.S. government as it seeks the extradition of Edward Snowden, who's accused of espionage for revealing U.S. surveillance programs.

Men with low-grade prostate cancer are choosing robotic surgery and other expensive treatments, even though they probably don't need treatment at all, a study says. Less testing and waiting before deciding to treat would reduce harmful side effects in many cases.

Kirk Bloodsworth left death row 20 years ago. He was the first death row inmate in the U.S. proven innocent using DNA evidence. He talks with host Michel Martin about his time in prison, and his mission to end the death penalty.