For nearly all of our history, our knowledge of this world has been woefully limited and often wrong. Travel back 5,000 years and have a conversation with a farmer in the Nile delta, and you would learn that every time the sun sets, that is the God Ra descending to the underworld to fight the demons of chaos and keep the universe in existence for one more day. If Ra were ever to lose that battle, the world would end. We modern time travelers would hear such a story and smile because we know better. Similarly, if we were to travel anywhere else in our past, to any region of the world, we
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