Technologies in 2001: A Space Odyssey well, such as a nervous breakdown—as Hal did in the film. Clarke noted that, contrary to popular rumor, it was a complete coincidence that each of the letters of Hal's name immediately preceded those of IBM in the alphabet. The meaning of HAL has been given both as "Heuristically programmed ALgorithmic computer" and as "Heuristic ALgorithmic computer". The former appears in Clarke's novel of "2001" and the latter in his sequel novel "2010". In computer science, a heuristic is a programmable procedure not necessarily based on fixed rules, producing informed guesses often using trial-and-error. The results can be false such
2001: A Space Odyssey (novel) movie frames show that the movie monolith has dimensions approximately in the ratio 0.65:4:9 or 1:6:14. In the book, HAL became operational on 12 January 1997, but in the movie the year is given as 1992. It has been thought that Kubrick wanted HAL to be the same age as a young bright child, nine years old. The famous quote that opens the film sequel ""—"My God—it's full of stars!"—is actually not in the "2001" film, although it is in the "2001" book. The name of the Saturnian moon Iapetus is spelled "Japetus" in the book. This is an alternative