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A conspiracy theory is an explanation of an event or situation that invokes a conspiracy by sinister and powerful actors, often political in motivation, when other explanations are more probable. The term has a pejorative connotation, implying that the appeal to a conspiracy is based on prejudice or insufficient evidence. Conspiracy theories resist falsification and are reinforced by circular reasoning: both evidence against the conspiracy and an absence of evidence for it, are re-interpreted as evidence of its truth, and the conspiracy becomes a matter of faith rather than proof.

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