Sesame Subjects: All About the Human Body is a 2009 Sesame Street book and CD set in the "Sesame Subjects" series. In the book, Professor Grover teaches Elmo and the readers all about the human body -- including how many bones are in the human body, what muscles are and what they do, how skin protects the body, and more. The zippered casebound hardcover book includes a read-along CD with songs, games, activities, and a fold-out poster.