It is a running gag among the civilizations of Earth to leave behind a pristine planet after each singularity, complete with fossils.
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While we puzzle together Earth's fake history and struggle with the Fermi paradox, they watch from afar and howl with inaudible laughter.
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"Zggt, making the continents match up in shape was a masterstroke! Their exobiology, it's all screwy from those plate tectonics ideas!"