This week's episode begins with Craig Pittman and his wife encountering red tide near their home in St. Petersburg.

Our guest is Cynthia Barnett, author of the newly published book, "The Sound of the Sea: Seashells and the Fate of the Oceans." Cynthia has written numerous books about Florida's freshwater, but dives into the salt for the first time here. She is also an environmental journalism professor at the University of Florida living in Gainesville.