Hold That Thought

According to the National Institute on Aging, experts estimate that more than five million people in the United States have Alzheimer's disease, a condition that damages memory and cognitive function. Dr. David Holtzman - Professor and Chairman of the neurology department at the Washington University School of Medicine and associate director of the Charles F. and Joanne Knight Alzheimer's Disease Research Center - explains what is happening in the brain of someone with Alzheimer's. He also describes his own laboratory's research into the disease and shares why he believes that it should be treatable.