A placebo is defined as an inactive substance (usually a sugar pill) which resembles a medication, given for psychological effect or used as a control in evaluating a medicine believed to be active. Up to now, much of medicine was built on placebos. They were extensively used for testing and research purposes. Interestingly enough, the idea and use of the placebo is older than its actual existence. In the early decades of the 20th century, most of the medicines prescribed by physicians were later found to hav
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