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American police have been reluctant to use systems that can scan live video for the faces of "persons of interest." Amazon wants to change that with a cheaper, cloud-based version of the technology.

The scale of the opioid addiction problem is immense. It has become so widespread, touching so many in states across the country that the administration has begun calling it "the crisis next door."

Authorities in Las Vegas say at least 50 people were killed when a gunman opened fire on outdoor concertgoers Sunday night. And, the three Americans won for their work on circadian rhythm.

Scientists say some of the earliest cave art found in Europe was done before humans arrived; thus, Neanderthal art, suggesting that our "brutish" cousins were capable of symbolic thinking.

With the increase, Congress boosted the overall military budget to $700 billion this year. The challenge: How to spend all that extra money before the fiscal year ends in September?

Researchers looked at states with medical marijuana dispensaries and those that allow home cultivation. They found lower use of opioids, when compared with states where marijuana remains illegal.

Former colleagues and legal adversaries describe Flood as smart, cerebral and a fierce defender of executive privilege, and say his hiring likely signals a more adversarial approach by the White House toward special counsel Robert Mueller's Russia investigation.

The U.S. ambassador to Israel, David Friedman, praised "the vision, the courage and the moral clarity" of President Trump in making the U.S. the first country to open an embassy in the disputed city.

NPR's Scott Simon talks with former ambassador Richard Burt about about what a nationalist foreign policy looks like and whether Donald Trump is channeling a shift in perspective on foreign policy.

The latest from the presidential campaign, as Donald Trump seeks to unify Republicans and Hillary Clinton looks ahead to a rough month of continuing primaries.