I think I already mentioned this entertaining story about teens using ultra high frequency noises as ring tones for their mobiles, frequencies that older adults can no longer hear. Well the New York Times ran a story on the ring tone yesterday, and they provided a sample of this ring tone for teens only. That set me off on a search for other people talking about this ring tone and I found this, which led me to this. Ochen K. was curious just how high he could hear this noise, and he created a sample of sound files at progressively higher frequencies. I can hear the noise up to 16,000 Hz, then nothing at 17,000. Absolutely nothing. A man’s got to know his limitations.