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.
A well written well constructed and researched discussion as to how we, homo sapiens sapiens, came to be what we are today and, probably, what we will become. I thoroughly enjoyed this book and would recommend it to anyone with even a passing interest in anthropology
A walk through human history from proto-humans with spears and digging sticks, through fire, clothing & shelter, art & music, agriculture, wheels and ships, clocks & machinery through to digital information. A good discussion of human technological progress perhaps spoilt a bit by pessimism in the final summing up