A scientist's exploration of the working of memory begins with a story by Borges about a man who could not forget. Imagine the astonishment felt by neuroscientist Rodrigo Quian Quiroga when he found a fantastically precise interpretation of his research findings in a story written by the great Argentinian fabulist Jorge Luis Borges fifty years earlier. Quian Quiroga studies the workings of the brain--in particular how memory works--one...