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    Sound Cannon

    The use of audio as a psychological weapon is well-documented, but the Nazis took things a step further by actually transforming sound waves into something that could cause lethal bodily harm. Dr. Richard Wallauschek was the mind behind the “sound cannon,” an array of parabolic reflectors that took the sound of a methane explosion and amplified and focused it dozens of times to create an excruciating beam of pure sound that was lethal to human beings at a range of 150 feet and caused pain and discomfort beyond that. The Nazis never managed to use it on the battlefield, but several inventors have continued to expand on the concept.