Dianetics: The Evolution of a Science by L. Ron Hubbard is the original article published in Astounding Science Fiction (cover date May 1950) published to immediately precede the release of Dianetics: The Modern Science of Mental Health that introduced Dianetics. Dianetics: The Evolution of a Science covers how Hubbard defined the reactive mind and developed the procedures to get rid of it. In England, this article was published in the June issue. In 1955, the article was expanded into a book of the same name (Bridge Publications, ISBN 1-4031-0538-3; not to be confused with the larger and more well-known book Dianetics: The Modern Science of Mental Health). The publication includes Hubbard's account of the reasoning behind, and development of, Dianetics, more so than its "sister volumes" DMSMH and Dianetics: The Original Thesis (aka The Dynamics of Life).
From September 1955 edition book changed several terms in the original edition, to keep with "Dianetics: The Modern Science of Mental Health" terminology. For example, the word "norn" changed to "engram". In Norse Mythology, Norn was name for goddesses of Fate: Skuld (the Future), Verdaude (the Present) and Urd (the Past). They controlled Man's destiny and made him follow a course of conduct nolens volens.
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