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Recent escalations of urban conflict and an increasing need for powerful, yet non-lethal weapons led to development of a sonic weapon that doesn't kill, but can make you pass out and even permanently deaf. Sonic weapons have been made popular by science fiction productions, but they are also used in reality, not to destroy buildings, tanks, but to injure, incapacitate, or kill an opponent. Although many real sonic and ultrasonic weapons are described as "non-lethal", they can still kill under certain conditions.