US Troops will soon have another weapon in the war against unruly people. The "Secret Scream" gun fires two ultrasonic waves that generate a focused audible effect when they overlap. causing "instant migraine[s]" and potentially even permanent deafness and cellular damage. While the current version is a largish vehicle-mounted version a handheld variant is in the works. The noise that the Secret Scream fires is a recording of baby's scream played backwards. How soon before we see the Secret Scream in use in high-school sex education classes? [Thanks, Aaron.]
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