How does the human memory work? The stories of John and Genevieve are helping scientists to understand. John's memory was damaged at birth. Although he is intelligent, he can't catch a bus or cook a meal because he forgets what he is doing. Genevieve's problem is the opposite - she wants to forget. She is haunted by a sexual assault and suffers from post-traumatic stress disorder. A pioneering technique could erase her memory with a pill.
