Parkinson's patients who had electrodes implanted in their brains improved more than those who took only medicine, according to the biggest test yet of deep brain stimulation.

Power outages spurred by the combination of bad weather and utility shutoffs in a bad economy could boost cases of carbon monoxide poisonings this year, health officials fear.

A Chinese woman has died from bird flu in a Beijing hospital, the government reported , but the World Health Organization said the case did not signal a new public health threat.