Science journalist Gretchen Reynolds, author of the recent article in the New York Times Magazine The Flu Hunters, about a possible flu pandemic. Also, Vitamin E controversy: Rent study finds the vitamin may be harmful in large doses and may shorten life span – others criticize the study; Stem Cells and Heart Attacks: Scientists make progress in research on using stem cells to heal hearts; Depression and Fish Oil: Scientists are saying we should rely more fish oils and less on pharmaceutical solutions to depression; Life Span and Activity: Another study shows an active lifestyle increases life span; Cholesterol and Genetics: There may be a new drug to stop the gene that produces cholesterol; Colon Cancer Gene: Scientists isolate gene involved in 20% of all colon cancer cases.