(Note: This interview originally aired back in November.) News flash: Cats do not meow at random. Nor do they hiss because they have nothing better to do. Cat sounds do have a purpose -- and they can carry important messages. But what ARE those messages? Our guest has some interesting answers: Susanne Schötz, a professor at Lund University in Sweden, is part of a long-standing research program exploring how and why cats use vocal communication...with each other and with their human caretakers. Schötz has a book out called "The Secret Language of Cats: How to Understand Your Cat for a Better, Happier Relationship."