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There is also a stream that holds that the signs of Inga were extraterrestrial engineering work. The president of the Centro Paraibano de Ufologia, Claudio Quintans, suggested that an alien spacecraft landed in the region of the Inga Stone. Another researcher, Gilvan de Brito, in the book "Viagem ao Desconhecido" ("Journey to the Unknown"), says that in the Inga's Stone exist formulas of the production of quantum energy and even mathematical including equations that might indicate the distance between the Earth and the Moon.