Cunning kids these days :-)
Story:
An invention called the Mosquito was developed last year by a Welsh security company to annoy teenagers and gratify adults.
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.
While most human communication takes place in a frequency range between 200 and 8,000 hertz, most adults' ability to hear frequencies higher than that begins to deteriorate in early middle age.
In a bit of techno-jujitsu, someone -- a person unknown at this time -- realized that the Mosquito, which uses this common adult abnormality to adults' advantage, could be turned against them.
The Mosquito noise was reinvented as a ring tone.
In settings where cell phone use is forbidden -- in class, for example -- it is perfect for signaling the arrival of a text message without being detected by an elder of the species.
Source
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