In the latest example of how technology's rapid evolution has created new challenges for educators, some U.K. and U.S. students are downloading a cell phone ring tone that is too high-pitched for most adults to hear--giving them yet another way to pass notes or other information surreptitiously in class.

Known as "Teen Buzz," the ring tone is spread from phone to phone via text messaging and Bluetooth technology.

The ring tone is a spin-off of technology that originally was meant to repel teenagers--not help them. A Welsh security company developed

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