Audio tooth

A surgeon implants a tiny device into one of your teeth. This implant converts data received from a mobile telephone, radio or computer into vibrations, which resonate through your jawbone into your inner ear. You - and only you - can hear the informThe tooth implant is completely hidden, and the sound you hear doesn't travel through the air. So a city trader, for example, could hear information on the next big deal before his competitors, even if he were having a dip in the sea at the time.

Source: 7 June 2006