Researchers in Japan have developed a new way to operate iPods, cellphones, and potentially even wheelchairs hands free. How you ask? By Clenching your teeth. Using head gear with infrared sensors and a microcomputer, users can send a signal by simply clenching their teeth together for a second or two – just enough time to differentiate the movement from chewing gum or talking. While this early version is specifically designed to turn on music players, the research team at Osaka University believe the technology can be adapted for a variety of other applications. It's still unclear how the device will work for those pre-disposed to stress.

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