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I think a line needs to be drawn between intelligence and sapience/metacognition. With apologies to Descartes, I know I think, therefore I am. That is the line that currently seperates humans from other animals. Also, because of this distinction, we have developed empathy for our fellow humans and have used these wonderful brains we have to develop ways to take many of the pressues of natural selection away. But if you still doubt that some selection is at play, check out average height through the centuries.
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