This one gets a solid 4 for a couple of reasons: (1) For a book that I thought was more designed to be read than heard, this was engaging enough that I have several audiobook marks on my copy; (2) It's a book that helped me think about time in a different way -- like helping a fish conceive water for the first time because water is accepted as is; (3) I'm thinking of getting a physical copy of this book. Maybe it's the best of its kind, because it doesn't just deal with "how" but also your personal "why"!