The gun that shuts you up (without killing you)

Japanese researchers develop a gun that, quite literally, drowns out certain voices. Just what uses might it be put to?

Source: http://news.cnet.com/8301-17852_3-57388607-71/the-gun-that-shuts-you-up-without-killing-you/?part=rss&subj=news&tag=2547-1_3-0-20

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