Undaunted, Chatterbox marched off to a nearby bookstore and purchased What the Face  Basic and Applied Studies of Spontaneous Expression Using the Facial Action Coding System (FACS) , edited by Ekman and Erika Rosenberg.
The book was on sale because it wasn't very popular.
mnli hypothesis: The book was on sale because it wasn't very popular. premise: Undaunted, Chatterbox marched off to a nearby bookstore and purchased What the Face  Basic and Applied Studies of Spontaneous Expression Using the Facial Action Coding System (FACS) , edited by Ekman and Erika Rosenberg.