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The one sound that humans will never truly hear. True silence would actually make you go crazy and is not recommended whatsoever. The problem is that the quieter the room, the more your ears will be able to hear. They'll adapt and you'll start to hear your own blood flow and maybe even lungs or heart. That isn't something a human should think about for an extended period of time.

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To sum it all up, your own sound is what will drive you crazy. Imagine a pulsating headache that keeps on coming back. There'll be the highs and the lows and if you're unlucky, the highs will keep on getting higher.