Books by This Author A Trip to the Post Office with Sesame Street By: Christy Peterson Age Level: 3-6 Readers will love heading to the post office with their favorite Sesame Street characters to discover how mail works! They'll also learn how to write and send a letter. Sesame Street Friends Around the World: Welcome to Afghanistan with Sesame Street ® By: Christy Peterson Age Level: 3-6 Come along with your friends from Sesame Street and explore Afghanistan! Shop at outdoor markets, snack on pomegranates, play volleyball, and more. Major support provided by our founding partner, the American Federation of Teachers, AFL-CIO.With generous support provided by the National Education Association.