“On Titan there would be groups of people around the same age, who were educated together and worked together. Smaller cohorts would band together out of these to raise children. Usually it was in groups of half a dozen or so. There were different ways to structure them. It depended on compatibilities. There was a feeling at the time that pair-bonds didn’t have enough people in them to endure over the long haul—that they succeeded less than half the time, and children needed more. So there would be some larger number. Almost everyone thought of it as a child-raising method and not a lifelong
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