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Resources Links | Books | Special Thanks | Credits Trimble - All About GPS http://www.trimble.com/gps/index.htm Trimble, a company that manufactures GPS, offers an excellent online tutorial on how GPS works. Stephen Wolfram http://www.stephenwolfram.com/ This is the homepage of Stephen Wolfram, one of the contributors to "Today's Great Challenge." Books Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time by Dava Sobel Walker and Company, 1995 The Quest for Longitude edited by William J. H. Andrewes The Proceedings of the Longitude Symposium Harvard University, Cambridge, MA Nov 4-6, 1993 The Global Positioning System and GIS by Michael Kennedy Ann Arbor Press Inc., 1996 A Comprehensive Guide to Land Navigation with GPS by Noel J. Hotchkiss Alexis Publishing, 1997 Special Thanks Harvard Graduate School of Education students Julia Goldrosen, Tobey Jackson, Mona Zeftel and Ken Zimmerman William J.H. Andrewes, Curator, Harvard University Collection of Historical Scientific Instruments Kelly Beatty, Sky and Telescope Magazine Craig Evans Molly Frey, WGBH Interactive Dr. Tom Herring, M.I.T. Adgio Hutchings/RIO MUSIC Magellan Systems Corporation Dr. Francine Vannicola, U.S. Naval Observatory Credits Lauren Aguirre, Senior Producer Kim Ducharme, Designer Karen Hartley, Hot Science Developer Cassie Mere Johnson, Intern Brenden Kootsey, Production Technologist Sheri Lyn Rosenzweig, Intern Peter Tyson, Producer Jennifer Uscher, Production Assistant Great Challenge | GPS | Find Your Longitude Ancient Navigators | Resources | Teacher's Guide Transcript | Site Map | Longitude Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |