Only 20 people are known to have Hyperthymesia. They remember every detail of their lives One of the famous cases is actress is Marilu Henner from “Taxi.” She's one of only 20 people who has hyperthymesia. Hyperthymesia is a syndrome that allows one to remember details of theireveryday life for years. Whilethis might seem advantegeous, there is a huge downside. The problem with the syndromeis that people who have it have a hard time living in the present, because their minds are constantly remembering and living in the past. Marilu Henner has hyperthymesia and says shecan remember the details ofher everyday life since she was 11 years old. She was featured on a “60 Minutes” episode for her superior memory capabilities. The first patient diagnosed withthis condition said that the memories were a burden, because they came to him as a constant and unstoppable stream.