"Heads of warring nations could learn a lot about how to achieve lasting peace by watching dogs and cats who live in the same house."

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One thing I found out was that we need extended families. We need gangs. And, of course, if they're tribes and clans and so forth have been dispersed by the industrial revolution by people looking for work wherever they can find it. And a nuclear family, a man, a woman and kids and a dog and cat is no survival scheme at all. Horribly vulnerable.

— Kurt Vonnegut