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19. Focus on Fusion
    fusion
    http: //fusion.org.uk/focus/index.htm
    
    
20. Newton's First Law of Motion
    Newton's Law of Motion
    http: //aloha.com/~isaac/3laws/1mid.htm
    
    
21. The Virtual Nuclear Tourist
    http: //virtualnucleartourist.com/
    
    
22. National Museum of American History: Exhibitions
    Lightning.
    http: //americanhistory.si.edu/lighting/
    
    
23. Solar Heating and You
    The sun gives us energy in two forms: light and heat. For many years, people have been using the sun's energy to make their homes brighter andwarmer. Today, we use special equipment and specially designed homes to capture solar energy for lighting and heating.
    http: //eren.doe.gov/erec/factsheets/solar.html...
    
    

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