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One of my favorite quotes comes from Anthropologist Loren Eiseley. He said, \u201cIf there is magic on this planet, it is contained in water.\u201d In this episode I\u2019m going to prove it.\n\nA lot of you probably know that the first stage of my professional career was as a SCUBA instructor and commercial diver. I spent thousands of hours under the surface of the Pacific Ocean, enthralled by what my hero Jacques Cousteau called The Silent World. We divers used to laugh good-naturedly at that, because the ocean is anything but silent. It\u2019s filled with noise, and I\u2019m not talking about boats and such, although there\u2019s plenty of that, too. I\u2019m talking about snapping shrimp, parrotfish, ocean waves and swells passing overhead, the clicks of dolphins, the eerie call of whales, and all the other sounds we used to listen to and wonder about. \n\nBut it isn\u2019t just oceanic creatures that make noise. As you\u2019re about to learn, it turns out that freshwater ponds are filled with sound. Yes, that still, calm little pond over there may be quiet above, but most likely, below the surface, there\u2019s a whole symphony going on.\n\nMy guest on this program is an acoustic ecologist who has studied aquatic sound, but more than that, he has come up with ways to use sound as a predictor of freshwater environmental health\u2014and as a tool for the restoration of ponds in areas where human activity has degraded them.