Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound repeller." ...

TOKYO (Reuters Life!) - A Tokyo park has started playing a high-pitched tone at night that only young people can hear to help drive away teenagers who keep vandalizing the toilets and other facilities ...

They don't hear anything. Nothing, nothing. I don't hear anything. And I'm supposed to have very good hearing. Today we field tested the new ringtone, downloaded the sound onto the cell phone, and hit ...