Trump’s first term, campaign pledges and nominees point to how efforts to address climate change and environmental issues may fare.

Infectious diseases are often labeled “urban” or “rural.” Applying political labels to public health misses who is at risk, experts argue.

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

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

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

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

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.

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

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

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

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

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