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There is a sound you cannot hear… but it can affect your body in terrifying ways. It’s called infrasound. These are sound waves with frequencies so low that human ears can’t detect them. But your body still feels them. Scientists have found that infrasound can cause anxiety, chills, and even a sense of fear. In some cases, it can make people feel like they are being watched… or that something is nearby. Even more disturbing, certain frequencies can cause your eyes to vibrate slightly…