This week we're learning more about Alzheimer's disease, from the perspective of a researcher and a patient. We'll discuss Alzheimer's and brain degeneration with Dr. Lili-Naz Hazrati, neurobiologist and researcher at the Tanz Centre for Research in Neurodegenerative Diseases at the University of Toronto. And we'll get a first hand account of living with the disease from journalist Greg O'Brien, author of "On Pluto: Inside the Mind of Alzheimer's."