How Does the Most Powerful Sonic Weapon Work?
It's used for crowd control and can cause a lot of pain without touching you
http://news.softpedia.com/news/How-Does-The-Most-Powerful-Sonic-Weapon-Work-58453.shtml
http://news.softpedia.com/news/How-Does-The-Most-Powerful-Sonic-Weapon-Work-58453.shtml
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