-Quackery, the characteristic practice of quacks or charlatans, who pretend to knowledge and skill that they do not possess, particularly in medicine. The quack makes exaggerated claims about his or her ability to heal disease, generally for financial gain. It can extend to individuals or groups who deny science ("deniers"), who will cement their views by selectively choosing which pieces of science to accept and which to ignore. It can even include manufacturers of certain over-the-counter products and supplements, who tacitly suggest medical benefits that have never actually been established.

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