A new survey by the Marist Institute suggests that Alzheimer's is the most feared disease, even though far more people die of heart disease or cancer. Dr. Gary Small, director of the UCLA Longevity Center, has been studying Alzheimer's for more than 20 years. His new book is called "The Alzheimer's Prevention Program." He joins Madeleine to talk about the fear of Alzheimer's and whether that fear is justified.
