>>> Some dude tried hooking up a grid of electrodes to a person's tongue, 
>>> and after an hour or two they were able to navigate around a normal 
>>> office block without using their eyes.
>>
>> What were the electrodes connected to? A low res webcam?
> 
> Indeed, yes.

Then yup, heard of it.

I also saw a little vibrating device you put on your finger... Connected 
to a microphone and an amplifier... It's impressive how much deaf people 
"hear" with that thing. Not to the point of hearing loud noises. To the 
point of recognizing different music.

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