In 1962, Ettinger privately published a preliminary version of "The Prospect of Immortality", in which he said that future technological advances could be used to bring people back to life. This finally attracted attention of a major publisher, which sent a copy to Isaac Asimov; Asimov said that the science behind cryonics was sound, and the manuscript was approved for a 1964 Doubleday hardcover and various subsequent editions which launched cryonics. The book became a selection of the Book of the Month Club and was published in nine languages.