Study finds infrasound the likely horror in hauntings Boing Boing Spooky feelings in old houses may be caused by boiler sounds, study suggests | Psychology The Guardian That ghostly presence may just be bad plumbing Popular Science ‘The cause might be vibrating pipes rather than restless spirits’: increased stress and irritability from infrasound exposure may explain paranormal experiences Frontiers Infrasound Can Subtly Raise Stress and Discomfort, New Study Finds Sci.News