PowerPoint Presentation helpful invention websites:
http://www.invent.org/hall_of_fame/1_1_search.asp -National Inventors Hall of Fame
http://www.bergen.org/ECEMS/class/welcome.html - Academy for the Advancement of Science and Technology
http://www.nps.gov/edis/home.htm -Edison National Historic Site
http://www.historychannel.com/perl/search.pl?word=invention -The History Channel (Search for Invention)