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The almost entirely unknown psychologist, doctor, and psychiatrist Boris Sidis summarizes for the popular intellectual audience a significant portion of his life's work trying to understand and treat mental illness. What makes this volume important includes: Sidis' opposition to Freud on several key points; his theory's comprehensiveness, power, and congruence with modern science. It may even be said that this work remains today unrivaled on the topic of fear, though it was published in 1922.