Students are using a new ring tone to receive messages in class, and many teachers can't even hear the ring. Some students are downloading a ring tone off the Internet that is too high-pitched to be heard by most adults. As people age, many develop what's known as aging ear, or a loss of the ability to hear higher-frequency sounds. A Welsh security company developed the tone to help shopkeepers disperse young people loitering in front of their stores while leaving adults unaffected. The company called their product the "Mosquito."
http://www.msnbc.msn.com/id/13274669/
No comments:
Post a Comment