To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Can't imagine something can be more dull and boring than this book. Embarassing. Really.. How could anyone publish such rubbish?? Don't waste your money, time, sight, battery or oxygen to read it. It's the ecological choice to make.