Unlike our Moon, they can keep water in oceans liquid for more than 4 billion years.

The story of a wildflower that adapted to a severe drought in California raises hopes that evolution will come to the rescue ...

Sharks might not be a natural biological group, with most species potentially closer kin to rays than to an oddball group of sharks.

Roughly 425 million years ago, in the warm seas over what is now southern China, there lived a meter-long bony fish with jaws ...