“
[People consistently embrace] any excuse to divide between "us" and "them" - and showing distrust, even hostility, toward those in the out-group. During lunch breaks on the set of the 1968 movie Planet of the Apes, for instance, extras spontaneously separated into tables according to whether they played chimpanzees or gorillas.
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Max Fisher (The Chaos Machine: The Inside Story of How Social Media Rewired Our Minds and Our World)