Today I was reading The Oatmeal because it is HILARIOUS, and I found this quiz. It is a hearing test. This concept, that there is this frequency, this sound that teenagers are able to hear that most adults over 25 cannot because our hearing has begun losing its range, isn't new. But I saw it on The Oatmeal, wondered if I could hear it, so I clicked on it. I couldn't hear anything immiately, probably ONLY because of this sinus infection/throat thing I have going on, not because I am over 40 or anything like that. So I turned the volume up a little. Suddenly my work study student, who sits about 10 feet away outside of my office says "OH LORD WHAT IS THAT SOUND???" And I said, nonchalantly "Oh, can you hear that?" To which she replied "GOD YES IT IS AWFUL MAKE IT STOP."
And now I know exactly how I can rid my office of annoying students (not that we have any of course). With one little click.
Try it. See if you can hear it. Even if you cannot, but you want to drive the cats or dogs or teenagers out of the room, you may find it handy.