I was listening to Radio 2 today - Jeremy Vine show and they were discussing mosquitoes. These are not the insects, but a very high pitched alarm that can only be heard by the under 20's......
It is a apparently a proven deterrent for groups in this age group who congregate in certain places like carparks, outside corner shops etc. and cause problems for the rest of the community.
There are two camps of thought on this - one being the human rights issues of the youngsters that hear this very high pitched whine and have to move on.
The other is of course the pro-lobby that recognises the benefits of the device.
The Times link may explain a little further if you haven't seen it in the news....
Timesonline
Any thoughts?