One in four teenagers are in danger of early hearing loss as a direct result of listening to music on their personal listening devices (PLDs) like MP3 players and iPods. Personal listening devices like iPods and better MP3 players permit users to listen to crystal-clear tunes at high volume for hours on end a radical improvement over Walkman. But according to Tel Aviv University (TAU) researchers these advances have also turned these devices PLDs into a serious health hazard with teenagers facing the greatest risk. One in four teens is in danger of early hearing loss as a direct result