Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
Contains 54 separate chapters that focuses on different aspects of the thought process that one should inculcate. I'm sure most of it, if not all, will help impact a person in a positive manner because each of us have our own shortcomings. I would suggest you read this book after "Attitude is Everything".