The author of this book is the dean of the Department of Psychology at Harvard University. In the decades of research career, he focuses on memory - this mysterious and unpredictable research field. In this book, he answers for you what implicit memory is, what semantic memory is, what hippocampus is, what perceptual representation system is, what amnesia is, why so many children sexual assault victims under hypnosis, what relation between multiple personality and memory is? Thus, we can appreciate the importance of memory in the life.