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.
I love these little books. Better yet, I know my grands will love them too! We are doing a quick review of some of our homeschool lessons from last year, and this is one area I know we touched on only lightly. Not this year! We will all take turns reading aloud the info contained within, discussing it - and having fun with it (drawing pictures of the various wonders or showing their location of where they were on a map, etc.