A cell phone adults can't hear? Maybe I'm not an adult...
Here’s a story from AMERICAblog about a cell phone ring that adults aren’t supposed to be able to hear. It’s a very high frequency, and high frequencies are the first to go as hearing loss sets in. Well, I CAN hear it. But maybe by the time my future son gets a cell phone, I won’t be able to hear it. Of course by then, our cell phones should be able to stimulate our brains directly and we can be done with this primitive business of bashing air molecules around to produce sound waves.
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Of course there was that story previously about using this principal AGAINST teenagers: setting up speakers to play annoying noises in the high frequency range in places where their presence is not desired.