The World Communicates: The World Communicates

GPS and never having to say: 'Where am I?' - from NOVA, Australian Academy of Science

http://www.science.org.au/nova/066/066key.htm

GPS Primer - from The Aerospace Corporation

http://www.aero.org/education/primers/gps/

Global Positioning System Overview - from The Geographers' Craft Project, University of Colorado Boulder

http://www.colorado.Edu/geography/gcraft/notes/gps/gps_f.html

All About GPS - from Trimble GPS

http://www.physics.org/article-questions.asp?id=55

http://www.trimble.com/gps/

.How DVDs and DVD Players Work - from How Stuff Works

http://www.howstuffworks.com/dvd.htm

How a Digital Video Drive Works - Electricity and Magnetism, Molecular Expressions

http://micro.magnet.fsu.edu/electromag/computers/digitalvideodiscs/dvd.html

How A Compact Disc Works - a Java Applet from Electricity and Magnetism Interactive Java Tutorials, Molecular Expressions

http://micro.magnet.fsu.edu/electromag/java/cd/

 How Internet Radio Works - from How Stuff Works

http://www.howstuffworks.com/internet-radio.htm

How Wireless Internet Works - from How Stuff Works

http://www.howstuffworks.com/wireless-internet.htm

How the Airborne Internet will Work - from How Stuff Works

http://www.howstuffworks.com/airborne-internet.htm

Always consider how you search.  If you use inverted commas (eg. "Ancient Egypt") you will perform a more accurate search. 

Also, consider limiting the results to educational insitutions by adding site:.edu to your search terms

Referencing using the Harvard Author-Date System