Ancient DNA confirms Miracinonyx trumani was more closely related to modern pumas than cheetahs and had a more varied diet than previously thought.

The U.S. hasn't seen measles numbers like this since 1992. An epidemiologist explains what's driving the surge.

A boost to heat production and drawing in more oxygen may help Andean leaf-eared mice thrive at altitude.

Vaccination remains the priority, but some researchers are looking for drugs to fight the virus in people who don't get the shot.

With no training, bumblebees can work out how to use a ball like a ladder to feed on sugar from an out-of-reach flower.

Answers to key questions could help public health officials develop Ebola treatments, predict the outbreak’s trajectory and prevent a future one.

Lab experiments suggest mosquitoes can smell DEET and learn to associate it with food, but it’s unclear whether that happens in the wild.