Researchers say infrasound — low-frequency vibrations from things like pipes, HVAC systems, and traffic that humans can’t consciously hear — may help explain why some old buildings feel unsettling or “haunted.” Rodney Schmaltz, senior author and professor at MacEwan, says: “Consider visiting a supposedly haunted building. Your mood shifts, you feel agitated, but you can’t see or hear anything unusual. In an old building, there is a good chance that infrasound is present,…

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