The estimate pops up again and again in reporting on the West’s most important waterway, but one researcher thinks it might be slightly high. That might point to a bigger problem.

A Conservation K-9 named Blue will help reduce human-wildlife encounters in busy areas of the South Rim in Grand Canyon National Park.

On investigative travels and assignments, author Scott Thybony is no longer surprised by the unexpected questions — and answers — he gets. Thybony remembers some surprising interactions he’s had along the way in this month’s Canyon Commentary.

The National Park Service will lift restrictions in 36 parks, including 114 closures and hunting prohibitions. The order could impact recreation areas across the Southwest.

The North Rim of the Grand Canyon is back open, and officials are keeping an eye out for floods this summer following last year's Dragon Bravoe Fire.

The San Francisco Peaks volcanic system includes some tiny residents — small, rare plants that grow in difficult terrain. Citizen scientists are trying to document them.

State media photos on the place showed it is likely a plant to produce weapons-grade uranium.

NPR's Steve Inskeep asks Jonah Goldberg, editor-in-chief of The Dispatch, about whether President Trump's political controversies are interfering with his legislative agenda.

Satrapi was the author of the acclaimed graphic novel "Persepolis" and a leading champion for women's rights in Iran. Satrapi's death was confirmed by the French presidency.

In the summer of 2020, sixteen-year-old Antonio Mays Jr. traveled a thousand miles to join the racial justice movement of his generation. He arrived in Seattle during the Capitol Hill Occupied Protest, known as CHOP. Less than a week later, he was shot and killed there. The case remains unsolved.

There is an effective vaccine for Ebola — but not for the variety spreading rapidly in the Democratic Republic of Congo. Trials are going on for several candidates. How long will it take?