Found this interesting. As you likely know, our hearing degrades over time, starting with the higher frequencies. People have actually come up with annoying tones to get younger people to leave areas where they are not wanted.
Here's one test.
Interestingly enough, I can hear that one just fine, and I'm 35.
Here's one test.
Interestingly enough, I can hear that one just fine, and I'm 35.

unk:
. Reminds me of when someone leaves on a CRT tv
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