gah...this is depressing.
A friend recently posted this link to "TrainHorns.net", where you can listen to a sound frequency that is supposedly only audible to those age 25 and younger.
I had read about this before (and that kids were using it as a ringtone to take calls while in school without the teacher hearing it) but this is the first time I ever gave it a try myself.
I failed miserably--didn't hear a thing.
At first I thought maybe it was a hoax, but then I tested it out on my 8-year-old, and she heard it loud and clear.
Getting older sucks.
Created by Train Horn