Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Hilariously funny story of a country GP in rural Ireland. Gives a good insight as to what it's really like on the other side of the desk. Do all his patients desperately need and demand antibiotics? The mind boggles!!. Anyway highly recommended and enjoyable read.