Howard Stapledon has invented the Mosquito ("small and annoying"), a device that emits a high-frequency pulsing sound that can heard by most people younger than 20 and almost no one over 30. The sound is designed to so irritate young people that after several minutes, they cannot stand it and go away. So far it has been tested at only one place, at the entrance to the Spar convenience store in South Wales. The teenagers would plant themselves on the railings like birds on telephone wires, smoking, drinking, and shouting rude words at customers. The owner planned to blast classical music into the parking lot, another method known to horrify hang-out youths into dispersing, but never got around to it. Then Mr. Stapleton offered a free trial. The results were as if someone had used anti-teenager spray around the entrance.
