In this episode of Talk Nerdy, Cara is joined by science reporter, producer, and Radiolab co-host Lulu Miller to talk about her new book, "Why Fish Don't Exist: A Story of Loss, Love, and the Hidden Order of Life." Lulu shares the incredible story of taxonomist David Starr Jordan, and in doing so, opens up the conversation to the power and consequences of imposing order on the world around us in the form of labels, categories, and impossible constraints.