"The device works by emitting a pulse at 17-18 kilohertz that switches on and off four times a second for up to 20 minutes. Teenagers can pick it up through minute hairs in their inner ears – but those hairs tend to die off by the time they reach 25."Don't miss the full text of the article, which has samples of the actual sound (which I can hear quite easily, though I'm supposedly too old).
Friday, February 22, 2008
Teenager repellent
Boing-Boing has a link to an article about an ultrasonic anti-teenger device in use in Britain.
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They're using these in the states, too, by the way -- I saw it on the news a few months ago. Apparently you can download ultrasonic/ super high pitched cellphone rings so that your teacher can't hear it. At the time I thought, oh cool . . . oh wait, don't we already have ones that vibrate?
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