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.
Great story on how you can think outside the box educating children. Making the learning process, fun is a great way to grab the attention of children, while teaching. It also makes them more excited about going to school and excited about coming home and sharing their day.