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"And this, folks, is yet another reason why the Land of the Rising Sun is truly one of the world's greatest places. Japan, which is famous for having ridiculously polite citizens and some of the zaniest toys known to man, has just delivered its latest gem: the Age Prediction Machine. As you might expect, the device simply emits the now-famed \"mosquito tone,\" which is an exceptionally high pitched frequency that can't typically be heard by older humans. Depending on the intensity of the sound, you're able to determine where the cutoff is between hearing it and not, thus discovering the age of whoever would be gullible enough to stand around and actually engage in this sort of lunacy. But seriously, don't use this the day before your mother's birthday -- just ask pops which number she's about to celebrate / not celebrate, cool?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2010/02/27/japanese-age-prediction-machine-is-really-just-a-mosquito-tone/>