Summary: <p>When you drop a letter in a mailbox, how exactly does it end up where it's supposed to go? We'll find out how the U.S. Postal Service works and why it's struggling for survival. <a rel="nofollow" class="guestlink">Nancy A. Pope</a>, curator from the National Postal Museum and organizer of <a rel="nofollow" target="_blank" href="http://www.postalmuseum.si.edu/systemsatwork/exhibit.html">Systems at Work</a>, and <a rel="nofollow" class="guestlink">Richard John</a>, professor at Columbia University School of Journalism and author of <span class="book"><a rel="nofollow" title="buy this book at Amazon" target="_blank" href="http://www.amazon.com/exec/obidos/ASIN/0674833422/wnycorg-20/"><em>Spreading the News: The American Postal System from Franklin to Morse</em></a></span>.</p>
