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The link between the immune system, cancer,and the emotions was cobbled together somewhat imaginatively in the 1970s. It had been known for some time that extreme stress could debilitate certain aspects of the immune system. Torture a lab animal long enough, as the famous stress investigator Hans Selye did in the 1930s, and it becomes less healthy and resistant to disease. It was apparently a short leap, for many, to the conclusion that positive feelings might be the opposite to stress - capable of boosting the immune system and providing the key to health, whether the threat is a microbe or a tumor.