How old are your Ears? ;-)

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Ever heard of "Mosquito Ringtones"? Apparently your ears lose some sensitivity as you grow older,made worse by long term abuse of them with loud music,industrial noise without hearing protection,and loud environments in general. It's been found (and recently exploited!) that the young have a higher threshhold for sounds,so the "Mosquito ringtone" was created..basically,a School student should be able to hear a high frequency tone whereas the teacher could not. So the student installs a "Mosquito Ringtone",and therefore can hear a high pitched tone to announce an SMS message,as they could probably get away with picking up a message in class,but not a phone call.. here's a site that offers a range of progressively higher tones to test your hearing-use headphones for best results..which is the highest tone you can hear? http://journal.plasticmind.com/ears/mosquito-tone-or-how-to-tell-youre-a-youngun/