Ambient Ultrasonics: Sounds Not Everyone Can Hear
#1
Hmmm 
https://www.livescience.com/62533-ultras...nitus.html
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#2
I have a fair bit of experience with being able to hear shit other people can’t.
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#3
https://www.yahoo.com/lifestyle/try-it-c...54778.html

This article talks about some major retailers having an ultrasonic “young people repellant” to keep youths from congregating outside. I’ve heard these at a couple stores over the years and figured they must be to keep animals away or something.
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