This material may not be published , broadcast , rewritten or redistributed . + Are superheroes bad for kids ? > > > the break. new health news showing the downside we all feared from our portable electronic age . a significant number of teenagers have lost some of their hearing , and that problem has gotten much worse in recent years. our report from our chief science correspondent robert bazell . > > that 's okay. we 'll be done soon . > > reporter : vanessa ackerman is a recent college graduate who helps her friend with her clothing design business . > > this is all the new stuff from the line . > > reporter : they both go out to hear loud music a lot. one night recently vanessa lost her hearing for three days . > > i never thought i would wake up and feel like a 90-year-old woman that can 't hear anything . > > reporter : the research out today looked at the most recent government survey , and found that one in five adolescents has some hearing loss .