Brad Williams remembers the day this picture was taken: July 28, 1964. He recalls that his family was on vacation in the Badlands. It was Tuesday. The temperature hit 100. Funny Face drinks were in the Thermos. In fact, he remembers pretty much everything that has happened in his life each day before and since. Williams, 51, is one of only three known people with hyperthymestic syndrome, and researchers want to know why they have indelible memories. full story