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Tags: alien, ancient alien, carl sagan, erich von däniken, extraterrestrials, in search of, pseudoscience, rod serling, ufo, unidentified flying object

Tags: advanced technology, alien, ancient alien, carl sagan, chariots of the gods, erich von däniken, extraterrestrials, harold t. wilkins, nova, pbs, pseudoscience, pyramids of egypt, shklovski, ufo, unidentified flying object