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Originally Posted by kingstu
I once read a science fiction book where a character in the book said that the natural social organization of human beings is a tribe. I find this to be completely true which is why we tend to distrust those who look different. In a tribe everyone looks very similar and it closely related biologically.
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You don´t have to read a science fiction book to hear that - many social scientists are seeing it the same way.
By the way, do you remember what author that was? Robert Heinlen?