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Scientific Discoveries

National Academy of Engineering: Greatest Engineering Achievements of the 20th Century
http://www.greatachievements.org/

Smithsonian: The Lemelson Center:
A variety of links to various sites that explain how inventions have changed our lives
http://invention.smithsonian.org/resources/default_online_articles.aspx

MIT: Inventor of the Week - Archive
http://web.mit.edu/invent/iow/i-archive-mh.html

Invent Now: Hall of Fame (Search by Inventor or Invention)
http://www.invent.org/hall_of_fame/1_1_search.asp

CBC Kids: The History of Inventions
http://www.cbc.ca/kids/general/the-lab/history-of-invention/default.html

HyperHistory Timeline
http://www.hyperhistory.com/online_n2/History_n2/a.html

The Great Idea Finder
http://www.ideafinder.com/history/timeline.htm

About.com: Inventions
http://inventors.about.com/library/weekly/aa111100a.htm