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Old 3rd August 2020, 07:57 AM   #2
Clutch Cargo
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Join Date: Dec 2016
Posts: 220
"... there is a gimmicky system said to be able to discourage teenagers from loitering, by playing a high-pitched whistle that, supposedly, only the youngest, healthiest ears can hear. It's intended to annoy, not to harm, due to the unpleasant sound."

I find that playing Bach or Vivaldi music works wonders even at normal volumes.
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