They're already doing that produce sound. http://www.wired.co.uk/news/archive/2013-02/04/google-glass-bone-vibration http://www.wired.co.uk/news/archive/2013-02

They're already doing that produce sound. http://www.wired.co.uk/news/archive/2013-02/04/google-glass-bone-vibration http://www.wired.co.uk/news/archive/2013-02/04/google-glass-...