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    Phone: The Great Work of Alexander Graham Bell that Inspired Technological Innovation
    3:48

    Phone: The Great Work of Alexander Graham Bell that Inspired Technological Innovation

     21  views
    Cai Lun: The Inventor of Paper Who Changed World History
    2:08

    Cai Lun: The Inventor of Paper Who Changed World History

     19  views
    How Antony van Leeuwenhoek Made His Tiny Lenses and Discovered a New World of Microbes
    2:14

    How Antony van Leeuwenhoek Made His Tiny Lenses and Discovered a New World of Microbes

     26  views
    Alessandro Volta: From Frog Leg Experiment to Battery Invention
    3:48

    Alessandro Volta: From Frog Leg Experiment to Battery Invention

     20  views
    Alfred Nobel: The Life Story, Discoveries, and Motivations Behind the Nobel Prize
    5:21

    Alfred Nobel: The Life Story, Discoveries, and Motivations Behind the Nobel Prize

     43  views