Mosquito Tone Test, or How To Tell You're A Young'un
Now for those of you who don't follow pop culture and web trends, et. al, a "mosquito tone" is simply a 17KHz sine wave that geeky youngsters have been known to use on their cell phone to alert them when they've got a text message so the teachers can't hear it. See, studies say that most of us old folks (I'm over 30 now) can't hear much above the 13-14KHz range. (See the full chart of who can hear what.)
Of course, when someone says most people can't do [x], everyone tries it. Sort of like when I read the Snapple cap that said no one can lick their elbow. Now that's a conversation starter. Anyhow, I fired up Audacity and generated a 17kHz tone, and wouldn't you know--I couldn't hear it. So I bumped it down to 14kHz and heard it. At 15kHz, I could hear it so long as I didn't tilt my head funny. At 16kHz, I could still hear it, but it was really faint. Then I actually decided that I could only hear it if I knew it was playing, but I haven't been able to test that until I have someone else press play.
My wife just walked in for her middle-of-the-night stroll and screwed her face up funny when I played the 18KHz sound. Show off.
Here are the sounds for you to test yourself with (Ren suggests headphones for best results, best meaning you're still a young'un). They're all 5-second long .mp3 files:
Done messing with your ears? Check out SymbolAssist a little tool I built for adding characters (like this ✌ and this ♬) to your your Twitter and Facebook conversations. (¡ʍʇɟ 'ʇsıssɐןoqɯʎs)