"You can even say that I hated myself at certain periods. I was too fat, or maybe too tall, or maybe just plain too ugly ... you can say my definiteness stems from underlying feelings of insecurity and inferiority. I couldn't conquer these feelings by acting indecisive. I found the only way to get the better of them was by adopting a forceful, concentrated drive."

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Twelve thousand years ago, everybody on earth was a hunter-gatherer; now almost all of us are farmers or else are fed by farmers. The spread of farming from those few sites of origin usually did not occur as a result of the hunter-gatherers' elsewhere adopting farming; hunter-gatherers tend to be conservative.... Instead, farming spread mainly through farmers' outbreeding hunters, developing more potent technology, and then killing the hunters or driving them off of all lands suitable for agriculture.

— Jared Diamond