Technological enhancement of human abilities with modern technology

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So, I've been thinking about how much computer technology has really advanced and how we do not recognize it's full potential. I mean, take a look on something like Raspberry Pi. It's considered something like a geek's toy, but really if someone had it in the late 90's he would be blown away with what this little board can do for that price. Yet alone something like a smartphone.

I think there are many, many ways to enhance our natural abilities with this tech. First thing I can think of is to take a pair of canalphones (earbuds that also isolate outside noise), connect it to a pair of high-quality compact microphones via some kind of board (maybe even Raspberry Pi) and configure software to automatically control audio levels (for example, normalize sound volume to protect you from loud noise like in a subway and allow you to hear some quite sounds more clearly) and add some extra functionality, like "repeat last 10 seconds of recorded audio", plus allow external audio input like your phone so you can listen to music and everything around you simultaneously. Maybe it's very silly, but I think it could be great.

What do you think? Do you have any ideas?