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Date: 2007-07-21 21:42:20Mysteries Open problems SETI Great Filter Zoo hypothesis The Universe Space colonization Earth in science fiction Extraterrestrial Civilizations Astrobiology Extraterrestrial life Fermi paradox | In the Great Silence there is Great HopeAdd to Reading ListSource URL: www.nickbostrom.comDownload Document from Source WebsiteFile Size: 38,41 KBShare Document on Facebook |