How could you lose your memory overnight, and what would it mean? When neurologist Jed Barash sees the brain scan of a patient with devastating amnesia, it is the beginning of a quest. His team of doctors explored the threat that people who take prescription opioids to treat severe pain may gradually put their memories at risk. This syndrome could shed light on the most elusive memory thief of all, Alzheimer's disease. Aguirre shares new information...