Most of us have fleeting memories. We remember only a few important things in our lives, often forgetting birthdays, anniversaries, names and even people. But for one teenager, it is different. Scientists have studied the teen, who has been given the alias KCL to protect his identity. According to the researchers, his memory is so strong that he can recall events from when he was just three months old. His memory is said to be sharper than that of 99.9 per cent of the population. Fewer than 100 people are believed to have highly superior autobiographical memory (HSAM), ScienceAlert reported.