Planetoid 127 and The Sweizer Pump

Edgar Wallace enjoyed writing science fiction. „Planetoid 127”, first published in 1929 but reprinted as late 1962, is a short story about an Earth scientist who communicates via wireless with his counterpart on a duplicate Earth orbiting unseen because it is on the opposite side of the Sun. The idea of a mirror Earth or mirror Universe later became a standard subgenre within science fiction. The ...