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Each night, the organisms gather in a "vertical stampede" to feed at the ocean's surface. Research suggests the columns of swimming animals can create large downward jets that help churn the waters.

For many students, Saturday was their first demonstration for a cause. They bundled in the U.S. capital, delivering a defiant message: stricter gun regulation. NPR photographers captured the scene.

The Supreme Court has left the case in the hands of the 5th U.S. Circuit Court of Appeals, which has scheduled oral arguments in the case for May 17.

The ecosystem has collapsed for 29 percent of the 3,863 reefs in the giant coral reef system, according to new research. Scientists are learning which corals are the "winners" and "losers."

The death toll was over 1,000. The survivors often feel the government has not helped them move forward. And they wonder if enough is being done to prevent new disasters.

A viral video is drawing attention to a problem in hospital emergency rooms across the country. More and more patients with urgent psychiatric conditions aren't receiving the care they need.

Over 10 years ago, the writer Wills Glasspiegel heard an album by Ahmed Janka Nabay at random, beginning a friendship that changed both their lives and helped to spread an electrifying form of music.

Amnesty International alleges that during last year's successful campaign to dislodge ISIS from the Syrian city, the coalition's airstrikes were "either disproportionate or indiscriminate or both."

Since 2013, Andres Gonzalez has traveled to Newtown, Parkland, Columbine and other sites of mass shootings to photograph the ephemera — letters, teddy bears, origami cranes — left in memorial.

We asked writers from across public radio to name the one album that's stood out during the first six months of the year.