everyone around the world people need some time for peace of mind or place where no noice and disterbance ,microsoft made a room which is so quit that u can hear you body parts sound like heartbeat and other organs sound ,that room is that quit which can (mental concentration/picking up of a liquid) levels of 99-100% designed for testing sound equipment and that room has measured at -20db ,and microsoft this room win guinness book of award for most silent room in the world ,and that room took 1 year time to build ,please upvote if you guys like my post
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