Humans have come up with some hair-brained belief structures over the years, one of the most fascinating to me being the once-common belief that all intelligent life was human (except of course for God et al), and so when other planets were discovered and people began speculating about what life was like there, the theories they came up with would've matched next-door neighbors better than space aliense.
Of course there have been some humans throughout all of history who speculated on such things, but en masse, most humans to ever have lived and contemplated such an issue held the belief that if there was life elsewhere in the universe, it would have to be human because that's what God chose to make.
So when did the masses really begin "waking up" on any historically noteworthy scale to realize that creatures from other planets may be nothing like us?
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