The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

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A room can be measured at minus twenty decibels. That is not a typo. Full video — The Quietest Place Humans Have Ever Built: https://www.youtube.com/watch?v=zYZ2ixB8IPg

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The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

The decibel scale is a human-defined measure, not a physical floor, so negative decibels a

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The decibel scale is a human-defined measure, not a physical floor, so negative decibels a