Get rid of the kids!!

Although I understand the impulse behind this machine, I find this fascinating yet deeply disturbing: The device, called the Mosquito ("It's small and annoying," Mr. Stapleton said), emits a high-frequency pulsing sound that, he says, can be heard by most people younger than 20 and almost no one older than 30. The sound is designed to so irritate young people that after several minutes, they cannot stand it and go away. Let's find yet another way to divide the generations--with sirens that keep us from having to deal with one another as fellow human beings. But why just those under 20? No one should have to put up with the very old either. Perhaps there is a machine that keeps them from driving or from fumbling for change in front of me at the register for ten minutes more than necessary.