The Null Device
Engineers in Britain have developed a super-miniaturised mobile phone that can be implanted in a tooth
. The phone receives digital radio signals and transmits them to the inner ear by bone resonance, in a way that no-one else can hear; it can be implanted during routine dental surgery.
No word on whether it contains any sort of microphone or means of sending sound.
(How much do you want to bet that the CIA/MI6/&c. have already had something of this sort for some time?)
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