We take it for granted that human beings are the pinnacle of the living world, that Homo sapiens is nature's most advanced and magnificently burnished product. And since numerous lines of evidence testify that our species is the result of a long evolutionary history, we tend to assume that in the future there will be more perfecting change along essentially the same lines.
Two million years ago, for example, our predecessors had brains barely half as large as ours today. So it would seem to follow that in another couple of million years, our brains will be twice again as large,...
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