have been coming to the Washington University School of Medicine in St. Louis to participate in some of the world's first clinical trials in Alzheimer's prevention. "It's the least I can do to help," said Hannah. "I feel like I couldn't live with myself if I didn't do it." Dr. Randy Bateman, who leads international clinical trials at WashU Medicine, said, "Now we have a chance to change the course of the disease in a way we've never been able to do before."