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Imported from Europe, the custom of leaving gratuities began spreading in the U.S. post-Civil War. It was loathed as a master-serf custom that degraded America's democratic, anti-aristocratic ethic.

The company says its Prime Air service will someday deliver packages up to five pounds in 30 minutes or less using small drones.

Leaders from around the world are converging on Paris for the 2015 U.N. Climate Change Conference. Listen to our special coverage to find out what you should know and what's at stake.

Oklahoma's earthquake boom is now a national security threat. No damage has been reported, but operators at the hub are on high alert for a disruption that would ripple through the U.S. energy market.

The LA area is home to the most manufacturing jobs in the U.S., from clothes to metal parts to new aerospace tech. Companies have reinvented themselves, even as they struggle to find skilled workers.

Coal is king in India. Some say there's little alternative. So how can this country, the world's third-largest polluter, provide energy and lift millions from poverty while trying to become "greener"?

An NPR poll finds nearly two-thirds of adults got this year's flu vaccine or plan to get it. Many of those who are skipping vaccination cite a lack of need and worries about side effects.

At least 19 young football players have died so far in 2015. Pediatricians are calling for changes in the way the game is played, including a move to non-tackle games.

The trials in the southeastern state of New South Wales are part of an $11.6 million program to protect beachgoers. Drones send real-time images of coastal waters to an operator using GPS coordinates.

The Oct. 3 strike on a Doctors Without Borders facility in Afghanistan — which killed 30 people — was found to be the result of human error, compounded by faulty equipment and communication failures.