Rare watering hole near border wall southwest of Tucson is drying up

The cause of the drop in water levels at Quitobaquito Springs is complicated, experts say.

Superfund Research Center Receives $10.6M to Study Mining Waste, Arsenic-Diabetes Link

The center, since 1989, has helped address the state's most pressing environmental contamination sites.

To Spot Future Coronavirus Flare-Ups, Search the Sewers

Wastewater-based epidemiology can test large groups of people and help better allocate scarce resources

Reclaimed water is back in Santa Cruz River near downtown Tucson, attracting wildlife

Here's why the Bighorn Fire got so big: weather, fuel, terrain

On June 17 in Tucson, Peter Norton watched smoke billow from the Santa Catalina Mountains. His shift at Mount Lemmon’s fire department had ended the day before, but he and another firefighter, Aaron Lindflott, had made a pact. When it was time to head back up the mountain to fight the Bighorn Fire, they’d be ready.

Can this tiny owl survive in one of America's fastest-growing states?

Conservationists want the cactus ferruginous pygmy owl back on the endangered species list, but opponents say it’s unnecessary.

Warming Will Reduce Trees' Ability to Slow Climate Change

Floods follow fires: Leaders prepare for post-Bighorn Fire monsoon

All eyes have been on the Bighorn Fire since it sparked on June 5.

But now, city and county leaders are preparing for what comes next — monsoon and flooding.

Fun Science Games You Can Play On Twitter

Looking for a new activity to do while staying home to social distance? 

A number of scientists host weekly games and challenges on Twitter. Players get to have fun for free while learning trivia about the natural world.

Alaskan megaeruption may have helped end the Roman Republic

For ages, the shadow of a volcano has hung over the fall of the Roman Republic. Ancient historians told of the Sun’s mysterious disappearance after Julius Caesar’s murder in 44 B.C.E., which was followed by bouts of cold and crop failures. Now, a team of scientists and historians has discovered that one of the largest known eruptions in history struck in 43 B.C.E.—potentially contributing to 2 years of weird weather and famine as the republic dissolved and the empire took shape.