What does a heartbeat sound like in the quietest place on Earth? This is an anechoic chamber: a room completely void of reverberations. Located at Orfield Laboratories in Minneapolis, MN, the chamber has been dubbed the “world’s quietest room.” After just 30 minutes inside, you start to hear your own heartbeat. In fact, the first half of this video is an audio recording of a heartbeat made inside the room's padded walls. Orfield Laboratories test the sounds of things—from consumer products to me
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