The listening devices on these pages are a great way of getting people to explore hearing. By playing with the ambient sound, they create a starting point for talking about sound and hearing. They're especially useful for science shows and fairs where it's really noisy and so other acoustic demos are difficult to do. They're also great for selfies. Below we also link from the science in the activities, to how the understanding is used by acoustical and audio engineers in their jobs. Funnel he...