Some students are downloading a new ring tone from the Internet that's too high-pitched to be heard by most adults, allowing them to receive text message alerts without teacher knowing.
(One teacher says her colleague played the ring for a classroom of first-graders - and all of them could hear it, while the adults couldn't hear anything.)
As people age, many develop what's known as aging ear - a loss of the ability to hear higher-frequency sounds. The ring tone is a spin-off of technology a Welsh security company developed to help shopkeepers disperse young people loitering in front of their stores while leaving adults unaffected.
*Associated Press
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