Answer: The answer to this question is the Printing Press.
Explanation: During the Renaissance, a new technological invention came out that changed how information was produced and spread. The Printing Press allowed for things like books, newspapers and written ideas to be mass produced for a larger audience. This changed how people spread information since it allowed for more people to get access to the idea in less time then it would take to hand make all the copies of said idea.
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The Wizard used tricks to fool Dorothy and her friends.