We had problems with a neighbour's cat repellent working on a similar frequency. The problem is that many adults can hear it, and it is a nusance to all younger people, most of whom are only guilty of being under 50. Babies and toddlers can't complain, only suffer. The 'senior' neighbours in question thought it a huge joke that all young people could be removed from 'their' world so easily. There is a simple solution for young people - keep your i-Pod playing or take your considerable custom to shops elsewhere.

There was a story a few months ago about teenagers in high school using high frequency ring tones so teachers wouldn't notice cell phone use during classes. When some teachers could hear the phones ring, the teenagers said it wasn't fair.

There was a story a few months ago about teenagers in high school using high frequency ring tones so teachers wouldn't notice cell phone use during classes. When some teachers could hear the phones ring, the teenagers said it wasn't fair.