Old” pacemakers may still work for years, so doctors are refurbishing used devices and donating them to patients in low- and middle-income countries.

Earthen channels directed fish into ponds that formed seasonally, providing a dietary bounty for Maya civilizations starting around 4,000 years ago.

Chlorine-based water treatments create many by-products, but one has been elusive. Its identification sets the stage for studying its health effects.

A multiyear study of dozens of wild, adult chimps suggests that play helps reduce tension and boost cooperation among individuals.

The first-ever close-up of an extragalactic star looks different than expected and might give a view of what stars look like at the end of their lives.

Every single Atlantic hurricane in 2024 had wind speeds supercharged by warming seas. One even jumped two categories of intensity.

Phobos and Deimos could have formed from asteroid debris, a new study suggests. An upcoming sample return mission will help test the idea.

The DESI project previously reported that dark energy — long thought to be constant — changes over time. A new analysis reaffirms that claim.

If future AI models are trained on AI-generated content, they could end up producing more bias and nonsense, researchers caution.

Mineral crystals in heart cockles’ shells protect symbiotic algae from ultraviolet rays and could lead to innovations in internet infrastructure.

In 2024, tobacco use among middle and high school students reached a record low, but new vapes and other products with nicotine keep coming.

If confirmed as head of the Department of Health and Human Services, Kennedy could influence U.S. policy on vaccines, drugs and food safety.