Freud published The Interpretation of Dreams in 1900. It introduced the notion that there existed certain predictable and identifiable processes by which dreams were formed.

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Medical knowledge and technical savvy are biodegradable. The sort of medicine that was practiced in Boston or New York or Atlanta fifty years ago would be as strange to a medical student or intern today as the ceremonial dance of a !Kung San tribe would seem to a rock festival audience in Hackensack.