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They're made of cotton. Or polyester. Or paper. Or polypropylene. Here's what researchers say about the effectiveness of the different types of face masks during this pandemic.

The name of the young ISIS fighter was not revealed in U.S. court proceedings, and the records are sealed. NPR has identified the fighter with the help of Iraqi officials and the teenager's family.

Among U.S. cities, New Orleans has the third-highest rate of young people who are neither in school nor working. Craig Adams Jr. is trying not to be one of them.

Why have so many soldiers committed suicide in recent years? The Army is looking beyond post-traumatic stress and asking whether bad commanders and destructive leadership are taking a toll.

As if the pandemic weren't enough, people are wondering whether climate change will cause pathogens buried in frozen ground to come back to life as the Arctic warms. How worried should we be?

The U.S. military is out of Afghanistan. Hurricane Ida left behind a path of destruction in Louisiana. The federal government is looking into five states' efforts to stop schools from requiring masks.

Before COVID-19 hit, tuberculosis was on its way out in Peru. But COVID-related disruptions to treatments could mean the rise of drug-resistant strains and twice as many deaths.

Ward, who died this week, is remembered as one of the first people to write seriously about rock 'n' roll. He wrote for Rolling Stone and Creem and was Fresh Air's rock historian from 1987 until 2017.

The U.S. Fish and Wildlife Service will decide whether to list the greater sage grouse as endangered. Many groups, including some oil and gas firms and a conservation group, don't want that to happen.

The U.S. imposes sanctions on Russia after it moves troops into regions of Ukraine. The economic fallout from Ukraine may be felt at gas pumps. Final deals in the opioid crisis are expected soon.