Obviously the most curious person who ever lived. Kind of quirky and funny too! What prevented me from giving a 5-star rating though is 1) There's no plot or storyline or even stringent chronological sequence; it's a bunch of interesting but unrelated situations that are only bound by Feynman's intriguing character. I.E. I was never aching to get back home and read the book to "see what happens next". Not all biographies are that random, 2) The fact that he only fleetingly mentions his life partners in a book that pretty comprehensively covers his personal and professional experiences is kind of shady and doesn't inspire as much trust as you generally expect to acquire when you develop a bond with the author.