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I was once introduced to the idea of transmitting audio signals through bone from my Electronics teacher in High School. We had a large conversation/brainstorming about making a wireless walkman - the CD would go in the walkman in your pocket somewhere, and transmit the signal to a piece in your mouth. You bite down on the piece, it vibrates and sound travels through your teeth into your jawbone, right to your ears. Stop biting, and you don't hear anything.
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