At the end of each chapter the question that came to mind for me was: So what? Sure, their is a lot of interesting information but don't expect to see the world from a new perspective.
"Instead, it might very well be that once the civilizational process is begun, there emerges a feedback effect, which by making the more intelligent in each generation more fit for reproduction, gradually increases the overall cognitive ability of the peoples inhabiting the evolving civilisations. Being smart in civilization is beneficial for your chances of reproducing yourself, and so the smarties get more numerous. Mr. Diamond doesn't see this."
Our intelligence evolved in pre-civilized societies. In civilizations, it does not require intelligence to reproduce. In today's world, those who are uneducated and living in poverty are the ones reproducing.
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