The quietest place on Earth is an acoustics and architecture test facility in Minnesota. The -9 decibel level is overwhelming because you can easily hear your own heartbeat, breathing, and stomach gurgles. Most people can’t last 20 minutes and are very confused when they leave.   Source
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Dogs hate the smell of pigs. There’s a “pig perfume” spray that can be used as a training tool to stop dogs from barking. Studies show that most dogs are completely dumbfounded by the spray, which stops them in their tracks.  Source
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