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Pseudoscience describes any belief system or methodology which tries to gain legitimacy by wearing the trappings of science, but fails to abide by the rigorous methodology and standards of evidence that are the marks of true science.
Promoters of pseudoscience often adopt the vocabulary of science, describing conjectures as hypotheses, theories, or laws, providing "evidence" from observation and "expert" testimonies, or even developing what appear to be mathematical models of their ideas. However, in pseudoscience there is no honest attempt to follow the scientific method, provide falsifiable predictions, or develop double blind experiments.
Although pseudoscience is designed to appear scientific, it lacks any of the substance of science.