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But Irving was also one of the leading experts in the world in a field of science that began right back in Bath when John Haygarth first waved his false wand. At that time, the English doctor had realized that when you give a patient a medical treatment, you are really giving her two things. You are giving her a drug, which will usually have a chemical effect on her body in some way. And you are giving her a story--about how the treatment will affect her.