Here's the Ultimate Hearing Test
Okay, try THIS at the office. Or home. (The link is to some free "mosquito tones" downloads, scalable by age.)
I turned up my computer speakers and hit "play" on the different tones, and drove people crazy, up and down the hall! It made them laugh! Now I'm popular! Finally!
Remember: These can be used for good or evil. The choice is yours. Currently, some apartment buildings crank up the tones to discourage ne'er-do-well youths ("utes") from hanging out. And, obviously, some people use them as ringtones that old folks won't hear.
I encourage you to use them to fight crime. Thank you.
There is a lot of individual variation with these.
My wife is 38 and can hear only 12kHz and above (labeled as "50 and younger).
I am 37 and can hear only 17.4 kHz and above (labeled as "24 and younger").
Posted by: Jonathan | March 05, 2008 at 05:06 AM
Well, something's wrong here. At the advanced age of 39, I can hear all of these pretty clearly.
Posted by: Mike Taylor | March 05, 2008 at 05:17 AM
The best is to let them play in the "background" at a frequency you can't hear and invite a bunch of teens over.
Keep telling them, they're crazy.
Posted by: RevJeff | March 05, 2008 at 12:16 PM