When we gaze into the night sky, we always observe superfast motion – even though nothing seems to be moving at all. But starting just ten human generations ago, we ourselves began traveling fast.
Our body speed didn’t change much during the first 2,000 centuries of human history. We walked or ran. An hour of effort let us sweatily advance ourselves from three to ten miles. After we tamed horses, we galloped for short distances.
In modern times the average American walks 65,000 miles in a lifetime: more than twice around the world. That’s not so different . . .
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