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Johannes Gutenberg invented the printing press that was used up until the 20th century.
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The first commerical exhibition of motion pictures was given in New York City using 10 Kinetoscopes.
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Radio station KDKA in Pittsburg, Pennsylvania produced the first commercially recognized radio broadcast.
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Briton Hadden and Henry Luce created the first weekly magazine in the United States.
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Philo Farnsworth is credited with inventing the current system of television.
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Soviet Russia launched Sputnik 1; the first artificial satellite to be put in orbit. Satellites are used for a number of things including communication, military, weather, and research.
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Adam Osborne developed the Osborne 1 which was considered to be the first actually portable laptop (it still weighed 24 pounds though).
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IBM Simon was the first "smartphone" invented. It had a touchscreen and some familiar features like calendar and game functions.
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Mark Zukerberg launched what is today's leading social networking site.
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Steven Chen, Chad Hurley, and Jawed Karim invented YouTube which is used to upload, view, and share videos worldwide.