ALTHOUGH WE LIKE to think we have moved on a lot from the days of living in the jungle, human beings still retain most of their instincts from our cave-age past. For example, we like to be part of a tribe. Anthropologists recognize that urban people still develop tribal groupings, complete with rituals (secret handshakes, special language or jargon, even special clothing), in order to have a sense of fitting in.
In our hunter-gatherer days, being part of a tribe was essential to survival: fighting off predators and finding food would have required a good-sized group. In modern times, being part of a tribe ...
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