Placebo treatments have been making people feel better for a long time. They've been working since long before Franz Mesmer was run out of 18th-century Vienna for "mesmerizing" a young pianist into regaining her eyesight, after all hope for a medical cure had been lost.
Doctors have long dismissed the placebo effect as inferior to conventional medical treatments that sometimes fail where placebo works well, including in surgical procedures like arthroscopy, a popular procedure that relieves the pain of arthritic knees.
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