A guy at work showed me a sound that is supposed to scare away kids and teenagers, similar to those devices that makes sounds that scare away mosquitoes. I guess the UK is using it to help encourage teenagers to no longer loiter near gas stations. Supposedly, in your early twenties we start having certain hairs in our ears die off which prevent adults from hearing the sound. So I tried listening to the sound and holy cow that sound hurts. It would definitely drive me away. My coworkers (most of them are in their 40's and 50') could not hear it. There was only one lady in her 40's that could hear it. It was kind of interesting to play with. The problem with the UK using it as a kid deterrent is that adults up to 35 could probably hear it and a few older than that could hear it to.
See if you can hear it:
http://graphics.nytimes.com/packages/audio/nyregion/20060610_RINGTONE.mp3
or try this site
http://www.freemosquitoringtones.org/
Just be warned: if you can hear this, it will probably not feel good if you have the volume up too loud.
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