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Scientists are alarmed at the increasing number of children and young people damaging their hearing by listening to too much loud music. A study of school children in Sao Paulo, Brazil, found that more than half of 11 to 17 year olds there had suffered at some point from tinnitus -often described as ringing in the ears. One of the researchers involved in the study is Tanit Ganz Sanchez who works for the Sao Paulo School of Medicine. (Photo: Israeli youths at a silent disco party in Tel Aviv, Israel. In order to prevent excess noise from bothering others within the surrounding neighbourhood, youth wear headphones synchronised to the music while dancing amongst one another. Credit:Uriel Sinai/Getty Images)