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Authorities said that the shooting suspect mailed letters to University of Nevada, Las Vegas employees across the country and that at least one letter contained a harmless unidentified white powder.

With Justice Brett Kavanaugh replacing Anthony Kennedy, a clear conservative majority could make regulating guns very difficult.

The U.S. is among the countries bringing portable AC units to the Paris Olympics this summer since the Athletes' Village won't have any. Many athletes are worried about competing in extreme heat.

In the WBUR podcast Last Seen: Posmortem, host Ally Jarmanning digs into the world of legal remains trading.

Damaging winds gusting between 55 and 70 mph are creating "critical" fire risks across LA and Ventura counties through Wednesday, officials say. Evacuation orders are expected to rise again.

Doctors at the trauma center at Los Angeles County-University of Southern California hospital deal with gunshot victims nearly every day, and their ability to save lives keeps improving.

We know that climate change will make water scarcer. But it could also have big economic impacts, Richard Damania of the World Bank says.

NPR's Mary Louise Kelly speaks with U.S. Surgeon General Vivek Murthy about his call to put a warning label on social media platforms. Murthy believes social media can harm teenagers' mental health.

This mercury-containing compound, used as a vaccine preservative, is commonly used in lower-income countries — and deemed safe. The U.S. is now demanding that Gavi, the Vaccine Alliance stop using it.

The once-hot Silicon Valley startup has seen its stock’s value decline 99% and is struggling to survive. That has put the spotlight on the genetic data it has on 15 million people.