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.
Reviewed in the United States on September 4, 2008
I listened to the cd in it's entirety today and I realize that I was wrong in my previous review. Please dismiss it if possible. This was a very informative and well made cd. My six year old who loves science enjoyed it, and so did my husband and I.