On this thought-provoking journey into the mind, NOVA investigates the mysterious nature of how we remember. Using cutting edge research, neuroscientists are exploring the precise molecular mechanisms of memory. By studying individuals ranging from an 11-year old whiz-kid who remembers every detail of his life, to a man who had his spider phobias vanquished, to a woman who even had memories implanted, scientists have uncovered a provocative idea: while for much of human history, memory has been seen as a tape recorder that faithfully registers information and replays it back intact; but memory is far more malleable, always being written and rewritten, not just by us but by others.