  Regarding those disembodied voices in your head: students at the RCA have designed a mobile phone that fits urlLink inside a tooth . A few things about this bother me: how do you switch it off? That is, how can you be sure it's switched off? And bearing in mind urlLink yesterday's story about mobile phones, would you have one permanently implanted in your head? On the other hand, considering the output of these tooth phones would be inaudible to anyone but the wearer, the rest of us may be spared the cretinous piping of ringtones, and devote our time to deciding who was merely the antisocial asshole on public transport, and who was the genuinely paranoid schizophrenic? 
