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Two mass shootings over the weekend, just hours apart, leave 29 dead in Texas and Ohio. When can a shooting like these be considered domestic terrorism?

Donald Trump won the election largely on the promise of cracking down on border crossings. When he takes office next week, he will be inheriting a quiet border, with crossings plummeting for the past few months.

Cosmic expansion stretches space itself, as if space were made of some kind of stretchy rubber material; there is no physical border, only stretching space, says astrophysicist Marcelo Gleiser.

Closing out his final overseas trip, Obama said he'd avoided ethical scandals by trying to follow the spirit, not just the letter, of the law and suggested Trump would be wise to follow his example.

Self-driving delivery robots have popped up on the sidewalks of Washington, D.C. — and other locations have expressed interest. The bots learn about traffic patterns with every trip they take.

In a strongly worded essay in The New England Journal of Medicine, the philanthropist calls for a global system to respond to future medical emergencies. We ask experienced Ebola hands to weigh in.

Jeb Bush's shifting positions on the Iraq War gave an opening to Republican rivals for the presidential nomination. And will Hillary Clinton answer questions directly on her trip to Iowa next week?

The authorities don't always listen. Women may be afraid to speak up. Around the globe, apps are giving them a place to document harassment on the streets.

That's the conclusion of a study performed as Washington, D.C., rolled out its huge program. The city has one of the largest forces in the country, with some 2,600 officers now wearing cameras.

When Bowe Bergdahl walked off of his base in 2009, soldiers and resources across Afghanistan were rerouted to search for him. Jon Thurman was with Bergdahl's company, and was a part of the weeks-long search after he disappeared. He speaks with NPR about that time, and how he feels about Bergdahl's guilty plea.