This NPR interview with a woman who's memory that allows her to replay her life like a movie is one of those fascinating glimpses into how little we understand about the brain.
The woman known as A.J. remembers thousands of details, by day and date, of things that happened to her years earlier.
She can recite detailed events about her life from memory, for example when the interviewer asks her what happened on April 13th 1987 she replies, "April 13 1987 was a Monday the first day of Passover and I was home with conjuctivitus.
She remembers all kinds of details by day and date, for example - on April 15 1990 she made cookies, on April 27 1994 her father went to Baltimore, her house smelled like ham on April 12 1998, on Tuesday July 1 1986 she ate at such and such a restaurant.
There have been other cases of people who had clear auto-biographical memories, but apparantly no one as detailed as A.J.
Oddly enough her particular memory skills did not help her academically. She cannot memorize dates or facts particularly well. She says she "feels" a day and likens each day to a video she has taken and stores on a shelf for easy retrieval whenever she feels like reliving it.
If you find this sort of thing interesting - a good, easy to read, book is Oliver Sack's The Man Who Mistook His Wife For A Hat : And Other Clinical Tales
Here's a link to a Wikipedia summary of some of the stories in The Man Who Mistook His Wife for a Hat that will give you a feel for what it's about.