Research published in the journal *Frontiers in Behavioral Neuroscience* reveals that low-frequency sound vibrations, known as infrasound, may explain why old buildings feel unsettling. Infrasound, which is below the audible range of 20 hertz, can be produced by aging infrastructure like pipes and ventilation systems, as well as natural events such as storms and earthquakes. Rodney Schmaltz, a psychologist at MacEwan University in Canada, led the study, which involved 36 undergraduate students who listened to calming or unsettling music while being exposed to infrasound without their knowledge. Those exposed to infrasound reported feeling more irritable and uncomfortable, with a significant rise in cortisol levels, a hormone linked to stress. The researchers suggest that humans might be biologically predisposed to react negatively to these inaudible vibrations, similar to how some animals sense impending natural disasters. While the findings are promising, the authors note that the small sample size and limited frequency tested indicate a need for further research to explore the broader implications for building design and noise regulations.