FactoAura on Instagram: "September 2015 – Microsoft set the world record for the quietest place on Earth! Their anechoic chamber in Redmond, Washington reached a staggering –20.6 dBA, so silent it’s closer to the limit of Brownian motion than human hearing. Inside this chamber: 🔇 No echoes – sound is absorbed instantly. 🛠️ Vibration control – built with concrete, steel, and springs to block all outside noise. 🎧 Product testing – engineers detect the tiniest hums, clicks, and vibrations in key