Encyclopedia Smithsonian: Inventors and Innovations http://www.si.edu/resource/faq/nmah/invent.htm History of Invention http://www.cbc4kids.ca/general/the-lab/history-of-invention/default.html Covers numerous inventions, such as: telephone, the light bulb, the hot dog, the electric guitar, pottery, plywood, the swimming pool, and penicillin.