Opens your eyes to a wide array of fallacies that govern our daily life (unknown unknowns, "experts" explaining past events as obvious in retrospect, the news, predictions, survivorship bias, confirmation bias, iatrogenics and a lot, lot more) — almost to a fault, i.e. if you take it too far, you'll see these fallacies everywhere and things like stories of success/failure, biographies (or history in general) etc. will no longer make the same impression.