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A mysterious die-off of freshwater mussels has biologists scrambling to figure out a cause. Freshwater mussels are critical to river ecosystems and to U.S. water supplies.

Every year, we ask NPR staff and book critics to share their favorite titles in our annual Books We Love guide. Here are 8 fiction picks that were standout stars.

What will negotiations look like in the weeks after the U.S. and Israel's strikes on Iran? Robert Malley -- who was a lead negotiator on the 2015 Iran Nuclear deal -- offers some insight.

In Minneapolis, underground healthcare networks of volunteer doctors and nurses bring care into the homes of families too scared of immigration enforcement to seek help.

The race between Susan Collins and Troy Jackson is one of this year's most high-profile Senate contests. To win, both candidates will need support from an especially powerful voting bloc: Maine women.

The Trump administration calls this an "economic D-Day" on Iran. Iran vows to respond to fresh sanctions in a "seismic manner."

Shelter villages offer temporary and private places for the unhoused to sleep and store belongings. One of the newest, The Bridge, opened recently in central Illinois.

The missile warning hit phones at 8:07 a.m. in Hawaii. David Ige didn't tweet a correction until 8:24. One reason for the wait: "I don't know my Twitter account log-ons and the passwords," he said.