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Japanese train commuters who don't want to reach conspicuously into their bags or pockets to start their iPods will soon be able to do it more subtly -- by simply clenching their teeth. Japanese researchers have developed head gear that uses infrared sensors and a microcomputer to let people operate music players by clenching their teeth. The computer receives a command when the user clenches his or her teeth for about one second -- which differentiates the action from other activities such as chewing gum and talking. The research team at state-run Osaka University hopes to put the device to commercial use for music players and believes it can eventually be adapted to run cellphones, wheelchairs and other products.
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