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The chalkboard has stayed around the longest. It is the most durable teaching tool.
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Paper and pencils started to become more and more avaliable
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New York City's school board first started using radios do broadcast lessons
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Started in the War and then made its way into school to project notes/information on a wall to students
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By now there where more than 50 educational channels
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This was created to easily mark multiple choice test
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in the US in 1984 it averaged about one computer for every 98 students
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Schools starting using these for math courses
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Changed the noraml white board with a board that connects with your computer and can be drawn on and things projected on it
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The ipad is now taking over classes, even kindergarden classes