Ancient Aliens Season 13 (2009)

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In a world in which there is so much mystery, many have pondered the ways in which human life may have sprung up on Earth. Others have explored the depths of what makes us human and whether or not we may have had help from extraterrestrials along the way. From the extraordinary construction of the pyramids to other unexplainable events in our past, experts dig into the possibility that we may not be alone after all.