Tiny, robotic fish powered by human heart cells suggest that scientists are getting closer to their goal of building replacement hearts from living tissue.

The symptoms of Parkinson's disease can vanish briefly in the face of stress or a strong emotion. Now scientists are searching for a treatment based on this phenomenon, a form of the placebo effect.

Early humans seemed to strike the perfect balance in situating their hearths in the cave, preserving ample sitting and cooking space while avoiding the worst effects of smoke.

Findings from a new study help answer questions about why some people get more severe and transmissible HIV than others — and serve as a reminder that viruses don't always weaken over time.

A satellite has detected massive leaks of methane, a powerful greenhouse gas, from natural gas plants and pipelines. Most of these releases are deliberate, resulting from sloppy pipeline repairs.

Instead of playing the same old tune, male song sparrow's sing a variety of songs to keep potential mates interested.

Scientists have shown that the brain uses multiple checkpoints to make sure we get enough water, but not too much.

A study finds tiny leaks from loose fittings added up to more emissions than when stoves were in use. The impact of U.S. gas stoves on climate change amounts to the same effect as a half-million cars.

All chimps managed by the National Institutes of Health that are currently eligible to go to a sanctuary have been moved there, but animal welfare advocates say more should be allowed to go.

The Food and Drug Administration is curbing the use of two out of three monoclonal antibody treatments because new data shows they aren't effective against the omicron variant.

A team of researchers has discovered the gymnastic ability of bark beetle larvae. Scientists recently recorded the larvae performing the twisting leap for the first time.

If nations don't address high greenhouse gas emissions, by the 2080s, all but one of the 21 cities that previously hosted the Winter Games wouldn't be able to do so again, a new study has found.

Some of the oldest human remains ever unearthed are the Omo 1 bones found in Ethiopia. For decades, their precise age has been debated, but a new study may have the answer.

For infants, toddlers, and children, one sign of an especially close relationship is if two people do something that involves exchanging saliva, like taking bites from the same piece of food.

Bald eagles, hailed an "American success story" were removed from the endangered species list in 2007. Now, researchers have found that lead ammunition has reduced their population growth.