A family with an astonishing rate of Alzheimer's disease may harbor a powerful new gene
A woman suffering from Alzheimer's disease walks in a corridor on March 18, 2011 in a retirement house in Angervilliers, eastern France. [AFP]

ELLIJAY, Ga. - Louise Lowman Lee remembers stories about her great-grandmother being put in a fenced area in the backyard, so she could wander safely. She watched her mother patiently care for her grandmother, who lost her reason, inhibitions, and ability to care for herself. Then Alzheimer's disease gradually eroded the brain of her devoted mother,…