It’s tempting and easy to think we are now much more civilized, intelligent and worldly human beings than those hunters and gatherers from the past. But, in fact, our brains barely evolved since then. Societies may have changed dramatically, we are still bound to move about in groups of just a 150 friends. Hunters and gatherers lived in groups of roughly 150 people. When the clan grew bigger, they split up. That number is still alive today, limiting sizes of
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