Learn how to conduct a classroom presentation to teach children about the causes and prevention of noiseinduced hearing loss. The tuning fork activity demonstrates that the stronger the vibrations, the louder the sound. Loud noise can damage the sensitive hair cells in the inner ear needed for hearing. It’s a Noisy Planet. Protect Their Hearing.® is a program of the National Institute on Deafness and Other Communication Disorders, National Institutes of Health, part of the U.S. Department of Health and Human Services. This video is part of the Noisy Planet Teacher Toolkit.