On one occasion, his mother a disease, therefore, Edison got a doctor : is your mother have appendicitis, surgery, must turn, then, he is very much at home from the hospital, but soon the darkness Edison moved brains, and cabinets on the chant. put a large mirror on the cabinet, therefore, a mirror reflecting light to save his mother, the doctor moved to say : "You save your mother, your mother, your life is to again! Thus, out of the Edison Electric!