The ability to take pleasure in one's life is a skill and is a kind of intelligence. So intelligence is a hard thing to evaluate and it manifests itself in so many different ways. I do think the ability to know how to live a life and not be miserable is a sign of that.

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I won't compare ants and people but ants give us a useful model of how single members of a community can become so organized that they end up resembling in effect one big collective brain. Our own exploding population and communication technology are leading us that way.