Adults in their 60s who scored lowest on memory and speed tests had a higher stroke risk years later, but the link disappeared after 70.

Wild harlequin frogs in Panama mostly survive where weather is wrong for a deadly fungus, and a new map shows where captive ...

Drought is increasingly affecting Swiss mountain forests at every elevation, potentially weakening their protection against ...

When a panther chameleon meets a rival, its rapid color change isn't a simple pigment trick. A complex biological process sits behind this transformation.

Threatened Yosemite toads face a hidden winter danger as deadly fungal infections surge while the animals hibernate ...

European rivers carry less organic waste and phosphate than in 2015, but only Slovenia is cleaning up fast enough for its ...

Humpback whales are famous for long migrations, but one isolated population stays in the Arabian Sea year-round.

A new mouse study suggests the brain may have no fixed information ceiling, as adding more neurons continues to improve processing precision.

Cosmic rays let a telescope read thunderstorms from the ground, and Earth's magnetic field explains why it sees far more storms to the east.

Hot, bright, and noisy bedrooms were linked with poorer sleep quality in young adults despite similar sleep duration.

Jaguars still have connected habitat in South America, but many populations elsewhere face growing isolation and weaker links.

How does the brain juggle so much information? A mouse study suggests neurons can switch jobs as memory demands change.