A recent New York Times article mentioned the new inaudible ring tones being used by students during class. The catch: the tones are very high frequencies. The adult ear gradually loses the ability to hear these frequencies with age, and the kids are using this to their advantage. I heard the sample provided by the Times just fine, but many others my age heard nothing. Ochen K took the argument a step further with frequency analysis and more sample audio. Can you hear these tones?
