There is a device to scare away groups of young people. It is called the Mosquito, designed to disperse gangs of loiterers. It is a device that emits a high frequency noise that supposedly only the young can hear, and it must be unpleasant in some way. Why else would it cause them to move away?

The noisy throng could probably be dispersed with a little more thoughtfulness. What do teenagers really hate? I'm told they hate cheap tippers in restaurants if they are servers and chat about gardening and coupon exchanges. Couldn't some very uncool people be sent to mix around the teenagers and talk about things that they find boring? I'm sure they would disperse like crazy.

If I lived in a high crime area with youthful perpetrators, I might have a more favorable opinion of this type of "mosquito", but my experience is that anything that hurts people will probably be used by sadists and jokers to torment. Because they can.

Here's another handy device that sounds like much the same thing.