Harold Stapleton has perfected a device - dubbed "The Mosquito" - which produces a noise highly annoying to teenagers. When switched on it is barely noticeable - but after 5-10 minutes it emits a piercing wail which can only be heard by people under 25 years of age. This might work a little more effectively, and create less of an annoyance factor, than the plan in effect in some of Sydney's southern suburbs - where Golden Oldies are being pumped out of/in areas where the young congregage and the old wish they didn't.
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