When Sue Halpern decided to emulate the first modern scientist of memory, Hermann Ebbinghaus, who experimented on himself, she had no idea that after a day of radioactive testing, her brain would become so "hot" that leaving through the front door of the lab would trigger the alarm. This was not the first time that Halpern had her head examined while researching Can't Remember What I Forgot, nor would it be the last. Halpern spent years in the company of the neuroscientists, pharmacologists, psychologists, nutritionists, and inventors who are hunting for the genes and molecules, the drugs and foods, the machines, the prosthetics, the behaviors, and the therapies that will stave off Alzheimer's and other forms of dementia and keep our minds-and memories-intact. Like many of us who have had a relative or friend succumb to memory loss, who are getting older, who are hearing statistics about our own chances of falling victim to dementia, or who worry that each lapse of memo