A newly identified Amazonian killifish is known from just three disturbed forest pools, prompting researchers to call for habitat protection. In…

A misidentified museum fossil has revealed Jeanerpeton mazonensis, a distinct amphibian ancestor that lived near present-day Chicago 309 million years ago.…

The search for North America’s biggest crayfish has turned a friendly rivalry into a scientific question about what limits their growth.…

The fluid surrounding the brain may hold another clue to Alzheimer’s, with elevated levels of an enzyme called meprin-β raising the…

Consistently high and irregular levels of the stress hormone cortisol are linked to faster cognitive decline in older adults. Releasing the…

Some of coffee’s most unusual effects have little to do with caffeine. Its other bioactive compounds can interact with the gut,…

A distant quasar’s distorted images could hold clues to what dark matter is made of. Simulations of dark matter behaving like…

New orbital evidence suggests the young Moon may once have generated its own magnetic field from deep within its interior. A…