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.
I like Paul Davies' other books, but this one is written in a strange style in which it seems to be appealing to teenagers. The whole layout, manner of writing, the diagrams, font, shape of the book even - all are geared towards sales - and those sales seem primarily the youngsters. The very title itself is misleading - intentionally no doubt.