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High pitched ring tone... adults can't hear

I just heard about this today and thought it was interesting for several reasons. The way teenagers adapted the technology in their favor, and why it was developed in the first place.

The war between teens and authority figures has a new -- or old -- front: ears. British shopkeepers tired of teenage loiterers have turned to the Mosquito teen repellent, which emits a high-pitch frequency that most teenagers can hear -- but not most adults.

But now teens have struck back against the Mosquito: They are using the same sound to communicate without adults' knowledge.

Read the entire story here.