A little boy referred to in case studies as “Sam,” showed convincing evidence that he is the reincarnation of his grandfather. Sam was 18 months old when his father was changing his diaper. Sam told his father, “When I was your age, I used to change your diaper.” Dr. Jim B. Tucker at the Psychiatric Department of the University of Virginia explained Sam’s story in a video posted on the university website. Tucker has explored 2,500 cases of children remembering their past lives.