The quietest room in the world is located in Orfield Laboratories in Minnesota. It contains multiple layers of sound absorbing material that remove nearly every echo. The environment blocks almost all outside noise. Inside the chamber, the sound level reaches negative nine point four decibels. This silence allows people to hear their own heartbeats and the movement of air inside their lungs. Sounds that normally stay unnoticed become clear. The brain attempts to adjust by focusing on internal no