An exploration of the question of whether it's possible for Earth to have been visited by aliens long before humans appeared on this world? Would we even know about it if they did? Those questions are tackled in this video.

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Cylinder Eight by Chris Zabriskie is licensed under a Creative Commons Attribution 4.0 license. [ Ссылка ]

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Intermission in D by Miguel Johnson

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Darkest Child by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. [ Ссылка ]

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