About 12 percent of school-aged children seem to be experiencing environmental hearing loss, according to a study in the July issue of Pediatrics. Researchers found that some children had what's known as a "noise-induced loss." They speculate the noises range from long-term exposure to lawnmowers to fireworks to stereo headsets. This kind of loss only gets worse with time and can cause difficulties in school and later in work. NPR's Larry Abramson reports.