It is a new gadget that could be straight out of George Orwell's 1984. Japanese researchers have invented the ultimate conversation killer and instrument of control - a machine that can shut someone up at will. Kazutaka Kurihara and Koji Tsukada have built a gun they call the 'Speech Jammer', which could be ideal for an unruly classroom or noisy library. It forces individuals into 'vocal submission', they say, and is accurate when fired from up to 30 metres away
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