Dianetics: The Evolution of a Science is L. Ron Hubbard's own story revealing how he arrived at his discovery of the Reactive Mind that underlies and enslaves Man. Written to coincide with the release of Dianetics: The Modern Science of Mental Health, Evolution of a Science was originally published as a book-length feature in a national magazine. The issue sold out within days, triggering thousands of letters and creating a storm of interest that grew into a worldwide phenomenon.