![]() ![]() ![]() The principle behind it is a biological reality that hearing experts refer to as presbycusis, or aging ear. It was marketed as an ultrasonic teenager repellent, an ear-splitting 17-kilohertz buzzer designed to help shopkeepers disperse young people loitering in front of their stores while leaving adults unaffected. The cell phone ring tone Musorofiti heard was the offshoot of an invention called the Mosquito, developed last year by a Welsh security company to annoy teenagers and gratify adults, not the other way around. "Adults are not supposed to be able to hear that," said another, according to the teacher's account. "Whose cell phone is that?" Musorofiti demanded, demonstrating that at 28, her ears had not lost their sensitivity to strangely annoying, high-pitched, though virtually inaudible tones. To the students' surprise, that group included their teacher. But one recent morning, a high-pitched ring tone went off that set teeth on edge for anyone who could hear it. ![]() One place was Michelle Musorofiti's freshman honors math class at Roslyn High School on Long Island.Īt Roslyn, as at most schools, cell phones must be turned off during class. Recently, in classes at Trinity and elsewhere, some students have begun testing the boundaries of their new technology. The technology, which relies on the fact that most adults gradually lose the ability to hear high-pitched sounds, was developed in Britain but has only recently spread to America - by Internet, of course. ![]()
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