'Listening is born of silence', says Douglas Quin who has traveled widely documenting the natural soundscape - from Antarctic ice to Arctic tundra and from African savannah to Amazon rainforest - for the past 30 years. His recordings of endangered and disappearing habitats represent one of the most unique and extensive collections anywhere. In Ep. 3 of The Sound of Things, Quin reflects on being a steward of sounds whose mission is to connect people with something precious and beautiful that they have lost.