Even when X-rays are normal, the scans can signal need for preventive steps, researchers say

Low levels of physical activity also tied to decreased mental function later in life, study finds

Researcher says heart benefits outweigh risk of side effects

But researcher stresses that risk is small, and women should be vigilant with screenings

Study finds better prognosis in women whose tumors have spread beyond the breast, nearby lymph nodes

Four 400-year-old specimens from France were well-preserved enough to show signs of the illness

Croatian study questions the link, but U.S. experts disagree with finding

But marijuana advocate calls the study 'speculative'

Study finds 'Back to Sleep' messages worked, but so did lower smoking and teen pregnancy rates

Recall of E. Coli-Linked Celery Includes 150,000 Products