be the same age as a young bright child, nine years old. In the book, Heywood took a ground vehicle for the 200-mile-journey from Clavius Base to TMA-1, a mobile lab "rolling across the crater plain at fifty miles an hour" that resembles "an outsized trailer mounted on eight flex-wheels" and is capable of hopping across obstacles "on its four under-jets". The vehicle is referred to as a "bus". In the film, however, Heywood took a wingless shuttle that flies the entire 200-mile journey. Even at moon-gravity, such flying may not be technically or economically feasible. Iapetus versus Japetus The name of the Saturnian moon Iapetus is spelled Japetus in the book. This is an alternative rendering of the name, which derives from the fact that "consonantal I" often stands for "J" in the Latin language (see modern spelling of Latin). In his detailed 1970 book on the film, The Making of Kubrick's 2001, author Jerome Agel discusses the point that Iapetus is the most common rendering of the name, according to many sources, including the Oxford English Dictionary. He goes on to say that "Clarke, the perfectionist", spells it Japetus. Agel then cites the dictionary that defines jape as "to jest; to joke; to mock or make fun of". He then asks the reader, "Is Clarke trying to tell us something?". Clarke himself directly addressed the spelling issue in chapter 19 of The Lost Worlds of 2001, explaining that he simply (and unconsciously) used the spelling he was familiar with from The Conquest of Space (1949) by Willy Ley and Chesley Bonestell, presuming that the "J" form is the German rendering of the Greek. Release details 1968, USA, New American Library (), June 1968, hardback (First edition) 1968, USA, Signet, July 1968, paperback (First paperback edition) 1968, UK, Hutchinson (), 1968, hardback (First British edition) 1968, UK, Arrow Books (), October 1968, paperback 1976, Arrow Books (), August 1976, paperback 1982, Roc (), November 1982, paperback 1985, Ediciones Orbis – Hyspamerica (), paperback, Spanish Language edition (2001: Una odisea espacial) translated by Antonio Ribera 1990, Orbit (), July 1990, paperback 1993, USA, Roc (), August 1993, hardback (25th Anniversary Edition) 1993, USA, Turtleback Books (), August 1993, hardback 1998, İthaki Yayınları (), October 1998, paperback, Turkish Language edition (2001: Bir Uzay Efsanesi) translated by Ardan Tüzünsoy 1999, USA, New American Library, (), October 1999, hardback 2000, USA, Roc (),