On HEALTH REPORT: The W.H.O. launches an effort to prevent deaths and injuries in the operating room.

On HEALTH REPORT: Evidence is seen for a possible cause of solid tumors, but many questions remain.

On HEALTH REPORT: Advice from experts about what to do -- and not to do -- when your ear is blocked with wax.

On HEALTH REPORT: A study looks at mutations that seem to play a part in extending longevity, while limiting growth.

On HEALTH REPORT: The U.N. releases a treatment report about developing countries. "For every two persons we manage to get to," says W.H.O. chief Margaret Chan, "another five persons get infected."

On HEALTH REPORT: Senator Ted Kennedy, 76 years old, has a glioma in an area where the best way to fight it may be with radiation and chemicals. 

Chan, at World Health Assembly in Geneva, warns of dangers of food security, climate change and pandemic influenza.

On HEALTH REPORT: Researchers are testing ways to remove diseased organs through the body's natural openings.

On HEALTH REPORT: The American Heart Association simplifies its guidelines for lifesaving action when a person's heart stops.

On HEALTH REPORT: Why did some supplies of heparin contain a chemical that should not have been there? A U.S. drug maker and a Chinese supplier face questions.

On HEALTH REPORT: A new fixed-dose drug could simplify treatment for millions of people.

On HEALTH REPORT: An update on recent developments involving the H5N1 virus.

On HEALTH REPORT: New findings suggest that people who are large around the middle in their 40s are more likely to suffer brain disorders in their 70s.

On HEALTH REPORT: Experts worry that the parasite that causes schistosomiasis could become resistant to an existing treatment.

On HEALTH REPORT: Rates in young children drop to zero in areas of the country included in a study.

On HEALTH REPORT: Researchers say unpublished studies show that Prozac and three similar drugs have significant results only in the most severely depressed.

On HEALTH REPORT: More people are using skin-lightening products, even if it means risking their health.

On HEALTH REPORT: A study says most people live a U-shaped life -- happiest when they are young and old, but middle age is emotionally low.

On HEALTH REPORT: The World Health Organization calls on governments to follow six policies to reduce smoking rates.