Sign up to see the future, today Can’t-miss innovations from the bleeding edge of science and tech There are unseen forces behind why a house might feel haunted — but no, it’s not ghosts. New research suggests that inaudible infrasound waves emitted by a building’s old boiler, pipes, and plumbing can negatively influence someone’s mood, making them feel unnerved and uncomfortable. That could be enough to convince them there are ghosts afoot, especially if they’re already open towards supernatural explanations. “What infrasound may do is supply a bit of bodily discomfort that a ghost or haunting explanation can then attach itself to,” Rodney Schmaltz, a psychologist at MacEwan University in Canada, and coauthor of a new study published in the journal Frontiers in Behavioral Neuroscience, told The Guardian. “For someone who is not inclined to think in terms of ghosts, the same sensation would probably just register as a stuffy, uncomfortable old building. For someone who is already primed, it might feel like proof of a spirit or presence.” Infrasound is the term for sound …