Senate Aging Committee examines Alzheimer's in Washington

Rudolph Tanzi, Ph.D., testifies about Alzheimer's disease before the Senate Special Committee on Aging on Capitol Hill in Washington on May 14, 2008. Tanzi is director of Generics and Aging Research Unit, Mass. General Institute for Neurodegenerative Diseases and professor of neurology at Harvard University. (UPI Photo/Roger L. Wollenberg)