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In page Aura (paranormal):

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Attempts to prove the existence of auras scientifically have repeatedly met with failure; for example people are unable to see auras in complete darkness, and auras have never been successfully used to identify people when their identifying features are otherwise obscured in controlled tests.[1][2][3][4] A 1999 study concluded that conventional sensory cues such as radiated body heat might be mistaken for evidence of a metaphysical phenomenon.[5]