In a surprising result, a blood vessel whose internal "clock" has been disrupted will continue to develop vascular disease even when transplanted into a healthy host, reasearchers at Georgia Health Sciences University reported Tuesday.

WASHINGTON - The worldwide spread of ancient humans has long been depicted as flowing out of Africa, but tantalizing new evidence suggests it may have been a two-way street.

On the eve of health advocates going before the Augusta Commission to ask for a tougher smoking ordinance, new studies are emerging on the potential dangers of secondhand smoke.

Blocking a common protein could help in fighting cancer, viral infections and precursors to heart disease, researchers are finding.

Effect of gene mutation could lead to new sleep treatments

WASHINGTON - The use of special computer games to train their brains improved healthy youngsters' ability to pay attention, scientists reported Monday.

WASHINGTON - The brains of homosexual men respond more like those of women when reacting to a chemical derived from the male sex hormone, new evidence of physical differences related to sexual orientation.

WASHINGTON -- Global warming could mean bad news for one of the world's most important crops, rice.

Even marine reserves, which are supposed to protect fish, apparently cannot save them when coral reefs start to decline.

WASHINGTON -- A chunk of the moon that landed on Earth as a meteorite contains a new mineral, which scientists have named after a researcher who years ago predicted the unusual process that formed the material.