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A long-term study of the world's largest known community of chimpanzees has documented a rare event: what the researchers describe as the primate equivalent of a "civil war."

People in poor countries often get little or no warning about floods, storms and other deadly weather. Local efforts are changing that, and saving lives.

A new study finds that horse whinnies are made of both a high and a low frequency, generated by different parts of the vocal tract. The two-tone sound may help horses convey more complex information.

Compounds from the family of chemicals known as PFAS can suppress the body’s ability to mount a defense against new pathogens—and the effects can last well into adulthood.

Wellness influencers tout the therapy's power for everything from rejuvenating skin and hair to boosting longevity. Devices sold for at-home use abound. We look at the evidence behind the hype.

Federal regulators want airlines to cut the number of flights at O'Hare Airport in Chicago this summer. It's an unusual move, sparked by a turf war between two major airlines with hubs at the airport.

The year began with many people becoming U.S. citizens, but by December, fewer people were doing so, driven by ramped-up scrutiny of applications and eroding trust in the system.

They're often paid low wages and lack job protections. A petition to the country's supreme court to support their demands did not see success — and they are protesting.

Three public golf courses in Washington, D.C., face an uncertain future as the Trump administration fights to take control of the historic courses from the National Links Trust.

A study in the Journal of Great Lakes Research used preserved whole lake trout and walleye samples to measure the accumulation of so-called "forever chemicals" in fish from 1975 to 2020.