This is no joke.
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Recently an article in The New York Times reported kids using a high-pitched sound as a cell phone ringtone.
Due to the fact that adults gradually lose the ability to hear high-pitched sounds, only people of a certain age can hear the sound. Depending on how good a person’s hearing is, they may still be able to hear the sound in their 20′s and 30′s.
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I’ve tested it with myself and an adult in his early 30′s. I could clearly hear the sound, while he could not, no matter how high I turned up the volume.
In an effort to preserve the file, I’ve made the MP3 available for download here