Pseudoscientists, by contrast, will tend to accept any testimony or anecdote that supports their desired belief. They will sometimes present large volumes of low-quality evidence, implying that a large amount of poor-quality evidence equates to high-quality evidence. Alternative medicine guru Andrew Weil, for example, supports the use of “uncontrolled clinical observations” in determining whether or not a treatment works. Such observations have a history, however, of being contradicted by later well-controlled and more reliable experiments. This is a lesson that good scientists have learned
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