In general, human societies are not innovative. They are hierarchical and ritualistic. Suggestions for change are greeted with suspicion; they imply an unpleasant future variation in ritual and hierarchy; an exchange of one set of rituals for another, or perhaps for a less structured society with fewer rituals. And yet there are times when societies must change.
Carl Sagan in Dragons of Eden: Speculations on the Evolution of Human Intelligence
Added by Catalin Popescu
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