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Deep beneath the rolling farmland of southern Minnesota lies a small, unassuming room that holds a world record. Orfield Laboratories in Minneapolis is home to an anechoic chamber so effective at blocking and absorbing sound that it has been certified as the quietest place on Earth, with a background noise level of…

• What makes the anechoic chamber at Orfield Laboratories remarkable?
• How does the chamber achieve such extreme levels of silence?