Have you ever noticed that sometimes the noise around you makes you feel so irritated that you are ready to kill thing or person making it? I feel such really often.
In ecology there is a term - noise pollution - that has no less impact on people's health then other kinds of pollutions.
Thinking about it an idea came to my mind. Why the record-player playing silence is not still invented?
Just imagine when you are really tired of noise you can just put on this device and Enjoy the Silence.
This device can really save your nerves and relationships with others, people would be much healthier and calmer, and it can even treat!

Oh how pity I'm not an engineer ….. (((