So the teen repellent sound used by shopkeepers in England has been turned to advantage. The best article I’ve found on it is from National Public Radio. Inventor Howard Stapleton, creator of the Mosquito teen repellent, says only a few people over age 30 can hear the Mosquito’s sound.
Click to hear it.
The best response I’ve heard comes from a teenager: when asked how schools might respond to an invasion of this ringtone that only students can hear: “Maybe they should hire more young teachers…” Hmmm. Truly, I think it’s a practical joke – I can’t hear a thing!