Modern medecine is already capable of plugging a kind of microphone to the ear nerve so deaf people can hear. The audio quality is still poor but somewhere in the future direct-to-nerve devices such as artificial ears and eyes will be available.Nerve control could be developped in such a way that normal, healthy eyes and ears could be unplugged temporarily, or regulated like the volume and brightness of your TV.
The best comes at night, when the neighbours are having a huge party and you want to sleep in silence...Things should come back to normal in the morning though, otherwise you won't hear your alarm clock ! Unless it is built-in your ears, so you hear it, but not your husband/wife, and can get up without waking him/her up.
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This would also be great for people with snoring spouses.