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.
This book is great! Mr. Chou is a man who cares deeply about making the world a better place. He also seems to know more than anyone about how to make you want to leap out of bed every morning and do all your most important tasks & work as if it was the biggest and most enjoyable game of all. - Life. I am a guy who has suffered from depression and severe apathy and nihilism. I know gamify everything in my life and his book is my new Bible. Yu-kai really is changing my life for the better!