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He's interested in why some people believe in the paranormal and he and his colleagues have been looking at the type of infrasound on the human body and mind. Infrasound is below 20 hertz. That's why humans can't hear it. For instance, storms, traffic, old infrastructure like pipes, defellations, sis, that is even so. They're machinery can all produce infrasound. And during this study, 36 participants listened to either the scary movie played during a horror movie or calming meditative music. Half of the volunteers were also unknowingly exposed to infrasound for about five minutes. Fly the samples were taken from each person before and after the experiment to measure cortisol levels. Humans couldn't tell if they had been exposed to infrasound, but when they were, they became more irritated and annoyed and reported the