Most marine mammals rely on sound for communication, foraging, navigation and predator avoidance. Scientists at the National Marine Mammal Foundation explore the sounds marine mammals make, the sounds they hear, and the effect of human-made sound has on them. The NMMF has developed instrumentation that allows hearing of stranded wild marine mammals to be tested. They have also determined the threshold criteria for exposure to sound that could affect marine mammal behavior and physiology, including hearing. This workshop describes the novel ways the National Marine Mammal Foundation studies acoustics and then engages the students in a variety of activities to demonstrate the science of sound and how we measure it.