electronic voice phenomenon (EVP)

Interest in EVP apparently began in the1920s. An interviewer from Scientific American asked Thomas Edison about the possibility of contacting the dead. Edison, a man of no strong religious views, said that nobody knows whether "our personalities pass on to another existence or sphere" but

it is possible to construct an apparatus which will be so delicate that if there are personalities in another existence or sphere who wish to get in touch with us in this existence or sphere, this apparatus will at least give them a better opportunity to express themselves than the tilting tables and raps and ouija boards and mediums and the other crude methods now purported to be the only means of communication.

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