There are promising developments in the quest to prevent Alzheimer's. We talk with a leader in the field, Dr. Sanjay Asthana, a keynote speaker at the forthcoming Markesbery Symposium on Aging and Dementia. And, we hear from Dr. Gregory Jicha of UK's Sanders-Brown Center on Aging about exciting research into a selenium compound underway in partnership with the Lexington-based bio-tech company, Alltech.