that over 55,000 copies had been sold and enthusiasts had established 500 Dianetics clubs across the United States. In July, Time magazine reported that it was climbing the U.S. bestseller lists. Campbell reported in the August 1950 Astounding that the magazine was receiving up to a thousand letters a week about Dianetics. Sales reached 150,000 copies by the end of the year. Campbell's endorsement had proven invaluable; Astounding Science Fiction had over 150,000 readers, many of whom were familiar with Hubbard's science fiction and had a strong interest in new scientific discoveries. Among the wider population, Dianetics gained popularity as a cheaper, simpler and apparently more effective means of self-improvement than conventional psychotherapies. Hubbard's optimistic view that Dianetics could alleviate the Cold War climate of tension and fear also struck a chord. One of his supporters, Frederick L. Schuman, wrote in a letter to The New York Times that "History has become a race between Dianetics and catastrophe". The success of Dianetics brought in a flood of money. Hubbard offered teaching courses for Dianetic "auditors" through the Hubbard Dianetic Research Foundation, costing $500 per person for four to six weeks of instruction and thirty-six hours of Dianetic therapy. Hubbard recruited his friend and fellow science fiction writer A. E. van Vogt to act as the Foundation's treasurer, and five other Foundations were soon established in Washington, DC, New York City, Chicago, Los Angeles and Honolulu. The Foundation's Los Angeles property alone was valued at $4.5 million. Opposition to Dianetics The scientific and medical communities were far less enthusiastic about Dianetics, viewing it with bemusement, concern, or outright derision. Nobel Prize–winning physicist I.I. Rabi, reviewing Dianetics for Scientific American, declared that "this volume probably contains more promises and less evidence per page than has any publication since the invention of printing." He noted that the publication of Dianetics had coincided with that of Worlds in Collision, a notorious work of pseudoscience by Immanuel Velikovsky, with which Dianetics shared the top of the best-seller lists. This, Rabi said, illustrated "the most frightening proof of the confusion of the contemporary mind and its tendency to fall prey to pseudo-scientific concepts." The Nation pointed out the lack of documentation in Dianetics: "No case histories are offered to substantiate his claims, nor is there documentation of any kind to indicate that any previous thinker, medical or otherwise, ever made a significant contribution to the subject