I was never on the side of my educational adversaires (as is obvious by my spelling), but I’d like to share this little teacher hack with you all.

Long story short, our hearing diminishes as we ages, and the high pitches go first. That’s why teenagers can hear high frequencies that adults cannot. The sounds aren’t pleasent, but they are a great way to send text messages in class — and teachers won’t hear a peep.

But teenagers will.

You can test your hearing at this site, and download hypersonic ringtones as well. What’s even cooler is that if you can’t hear the tone, download the ringtone and put it on speaker. Adults won’t hear anything, but if you go to the mall on full blast, you’ll sure annoy the hell out of some little punks, ages 5 and up 🙂

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