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2017
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Is science able to completely discount the possibility that there once existed on Earth any civilization as technologically advanced as our own, but now lost for whatever reason, say 100s of thousands, or millions or even a billion years ago?
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Is science able to completely discount the possibility that there once existed on Earth any civilization as technologically advanced as our own, but now lost for whatever reason, say 100s of thousands, or millions or even a billion years ago?
35
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