There's a small room in Minnesota that
blocks out 99% of all external sound. That's an impressive number! Also impressive: nobody can take more than 45 minutes alone in the room before they go nuts.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/jK85KKqavHY/the-quietest-place-on-earth-will-drive-you-insane-within-45-minutes
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