 One Slinker is described either reading or eating a page of a book in a great Thoth library, before being scared off by Tweel.The Thoth never developed nuclear power, but evidently had some other power source which has since been lost to them.It is suggested that Tweel's race travelled across the solar system at least 10,000 years ago, as Jarvis, Tweel's human partner and the protagonist of "A Martian Odyssey" describes seeing three eyes in the darkness inside a building - similar to the eyes of Triops Noctivians, a creature featured in a later story of Weinbaum's, "Parasite Planet".