According to Hong Kong's "Wen Wei Po" reported on April 5, the United States has a silent room in Southern Minneapolis, which can absorb 99.99% of the sound, and is included in the "the quietest place in the world" in the Guinness Book of World Records. . Humans staying in the dark and silent room for too long will feel unbearable, and begin to hallucinate. The record of the longest stay in the room so far is 45 minutes. In this secret room, even a short stay is unbearable. Offelte, the person in charge of operating the silent room, said that the silent room was built with fiberglass soundproof cotton, double-insulated steel walls and concrete, saying that he could only stay for 30 minutes. Offelt pointed out that when the environment is extremely quiet, human ears also adjust. The quieter the surroundings, the more sounds you hear, such as your own heartbeat, lungs, and even the stomach clucking. On weekdays, people rely on sound to identify the direction. When the sound does not exist, people will feel frustrated and must sit down. Organizations that use this silent room are all over the United States, including NASA. Astronauts are arranged to test how long it will take to simulate the space environment before they can hallucinate, and whether they can maintain their focus. There are also manufacturers that use to test products. Volume, sound quality, etc.
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