divergence far back in the past. For instance, Lord Kalvan involves a police officer who is accidentally transported to a world where the ancestors of modern Europeans failed to move into Europe. Instead, the nomadic tribes migrated across Asia and into North America. The people living on the eastern coast of North America in this novel settled the area from the west, and still live in a medieval society. Many readers point towards the short story "Genesis" (anthologized in The Worlds of H. Beam Piper) to suggest that the Terro-Human Future History universe is in fact an alternate world in the Paratime universe, where the Martians' escape from Mars resulted in their forgetting their heritage and having to start over. However, in several letters to friends and in an article published in a fan magazine, Piper himself listed the true Paratime stories, and he never identified "Genesis" as one. On the other hand, "He Walked Around The Horses" is referenced in "Police Operation" so that is a sidebar story to the series. By the same token, in spite of Piper's lack of explicit stipulation, "Omnilingual" (1957) — which concerns a near-future scientific expedition to Mars under the aegis of an international Earth government — may also be a Paratime story. The scientists and scholars involved in this effort are found in medias res excavating the ruins of the advanced human civilization which had been gradually destroyed on the fourth planet some 50,000 years before. In "Omnilingual" there is no mention of the northern hemisphere's thermonuclear devastation as a result of the NATO/Communist "cold war" kindled into an orgy of extermination by the impact of an antimatter meteorite, which was detailed by Piper in his story "The Answer" (1959). Throughout the Terro-Human Future History, that conflict and the destruction wrought across the nations of the First and Second Worlds is pervasive as an explanation of the precise manner in which the home planet's culture (by way of South America, Australia, and South Africa in particular) comes to influence the planets of Piper's Federation and Empire. Published works Terro-Human Future History Federation series Uller Uprising (1952) (refers to the 1983 edition) Four-Day Planet (1961) (refers to the 1981 edition: Four-Day Planet/Lone Star planet) The Cosmic Computer (1963, originally Junkyard Planet) (refers to the 1983 edition.) Based on the short story "Graveyard of Dreams", published in Galaxy Magazine February 1958. Space Viking (1963)