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John Cleves Symmes Jr.
Other · science
John Cleves Symmes Jr. is known for his theories regarding a hollow Earth, proposing that the planet contains inner realms inhabited by advanced beings. His ideas, while not directly related to UAP or UFO phenomena, have influenced speculative discussions about extraterrestrial life and hidden civilizations. Symmes' work connects to broader scientific and philosophical inquiries into the nature of the Earth and the possibility of undiscovered life forms.
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| Research |  | 23K | May 26, 2018 |
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