Hyperthymesia is an ability that allows people to remember nearly every event of their life with great precision. Hyperthymesia is a rare condition and just about 60 people in the world have been diagnosed with this condition. This condition is also known as Highly Superior Autobiographical Memory (HSAM). The patients (known as hyperthymesiacs) remember almost everything that has happened to them right from infancy and can describe any day of their lives in amazing detail. There are two defining characteristics of hyperthymesia: spending an excessive amount of time thinking about one's past, and displaying an extraordinary ability to recall specific events from one's past. Short and long-term memory and HSAM When you experience something, your brain stores it as a short-term memory. You probably rememb...