Wow, the eye protection post was pretty scary and then the topic turned to hearing protection. My daughter (6th grade at the time ) did a science project on hearing protection. We took a styrofoam display head (hollow in the center) and drilled out the ear canal with a 3/8 bit. She then placed a db meter inside. She used several types of foam ear plugs and a headphone type of protector. She played a preset volume of loud music in front of the head. All the protection worked as well as the label stated. She took and logged all readings with and without protection. If you have kids this is a simple project to do for a science fair. We should all heade the lesson.