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The Quietest Room in the World
The sound level in the room is -9 decibels. The walls, floor and ceiling absorb all sound, rather than reflecting it, as most surfaces do. It's so quiet that you become aware of even the slightest sound including the sound of your heart beating, stomach, lungs and ears. In fact, the sensation is so intense -- including the possibility of hallucinations -- that no one has been able to stay in the room longer than 45 minutes.
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