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Whatever you do, don't look behind you – because the answer isn't there, says psychologist Alison Gopnik. The real ghosts are glitches in your brain, and in a way, that's even scarier.
25 October, 2016
According to a 2009 Pew Research survey, 18% of adults in the U.S. say they’ve seen a ghost or at least felt its presence. An even greater number (29%) say they have felt in touch with someone who has died.
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