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Infrasound is described as any audio wave frequency that is lower than the 20Hz that can be detected by the human ear. There is no doubt that Infrasound exists and it can be both detected and created by audio technology. It can travel long distances and is often associated with natural phenomena such as volcanic eruptions and earthquakes. It may be the reason that animals can anticipate such events before humans can and researchers are now using infrasound detection equipment as part of civil defense early warning systems. Studies have shown that when humans are exposed to infrasound they develop feelings of supernatural awe, fear, depression and anxiety that can lead to complete panic attacks. Some researchers have even claimed that the 19Hz cycle is particularly associated with paranormal events and may be a stimulus for disruption of human vision creating the illusion of ghostly perceptions. If the source of the infrasound is powerful enough it can create vibrations in objects that make them appear to move of their own accord and even cause glass to break. Infrasound has been used at political rallies to stimulate the crowd, as a psychological weapon to demoralise the enemy and as special effects amplifiers in films. The effect of Infrasound on the human body is being explored in various studies but, as yet, it is not illegal to expose humans to such low frequencies even though the long-term health effects are unknown.