Factually wrong in many places. The cover holds a review of "full of curious facts" which should have warned me with the faint praise. It is indeed full of curious facts in that many of them relating to anything but a narrow field of medicine and statistics are wrong. It suffers from the classic problem these books have of trying to explain everything without nuance. The author admits he only had 100k words to work with, and fair enough it's tough to do it all under that limit. However, there's no excuse for the editing which sees numerous mistakes in the prose. It's easy enough to read and make you go "huh" on a couple of occasions, but it's certainly one you can afford to miss.