Charles Choi

Why are dogs, especially puppies, in endless pursuit of their tails?

Will the East African Rift split the continent and create a new ocean, or will it fizzle out?

The eruption was the most powerful natural explosion in over a century, triggering a tsunami hundreds of feet high.

Dogs commonly tilt their heads, but is it a sign of intelligence, or does it mean something else entirely?

The average life expectancy of a dog is more than 10 years, but life span varies greatly among different breeds.

The deadly toxin can be difficult to detect.

This is what sets us apart from the rest of the animal kingdom.

A new study of human DNA -- and the largest genetics study yet of ancient peoples -- reveals that the Paleo-Eskimos are genetically distinct from both the Neo-Eskimos and modern Native Americans.

Unusual fish that walk and breathe air turn out quite differently when raised on land, rather than in water. Their development holds clues to a pivotal moment in animal evolution, when the first creat

Certain types of gut bacteria could ward off food allergies, according to a new study in mice.

For older adults who have depression, playing computer games aimed at improving thinking skills may help more than taking an antidepressant drug, researchers say.

Arches, pillars and pedestals made of sandstone rock can look as though they defy gravity. But new research how such amazing rock formations take shape.

Whale sharks -- the world’s largest fish -- are appearing more frequently near the Azores islands, due to climate change, a new study finds.

Runners actually save energy by swinging their arms when they run, a new study finds. Runners burn more calories when the arms are held still.

The raptor dinosaur Changyuraptor yangi had the longest feathers yet seen on a feathered dinosaur, researchers say.

A new method of “supercooling” organs could lengthen the amount of time that a donated liver could be stored before it is transplanted into a patient.

It’s long been thought that stress can trigger heart attacks, and now researchers say they may know how -- in stressed people, heart attacks might be triggered by bacteria dispersing within artery wal

Reducing emissions of greenhouse gases like carbon dioxide could also reduce the amount of harmful air pollutants circulating, which could prevent millions of premature deaths annually by the year 210

Scientists have found a waterfall-climbing goby fish uses the same muscles for both feeding and climbing.

How Dolphins Stay Awake For Two Weeks Straight