This article is particularly interesting as just today I was doing some hearing tests on my sister and mum. I found out I was able to hear up into the 20khz range, my sister about 19 and my mum only heard up to about 15khz.
Anyways, the article here presents this as a means of driving younger people away from certain locations. Quite intersting....
You can test your hearing here. The WWW Tinnitus Test Narrow Band Noise lets you test out your hearning range.
Rowdy teenagers beware: the Mosquito is coming
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