In this July 29, 2013 photo, Emily Rogalski, a neuroscientist at Northwestern University’s cognitive neurology and Alzheimer’s disease center
In this July 29, 2013 photo, Emily Rogalski, a neuroscientist at Northwestern University's cognitive neurology and Alzheimer's disease center in Chicago, holds a human brain in the center's laboratory. Rogalski is the study leader in the research of a rare group of "super agers" _ men and women who are in their 80s and 90s, but with brains and memories that seem far younger. (AP Photo/Scott Eisen)