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Pencils and paper first became readily available in the 1900s, they replaced slates formerly used by students.
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Thomas Edison said "Scholars will soon be instructed by the eye" when the film projector was introduced. This allowed for learning to extend beyond text books.
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Overhead projectors became common in classrooms after originally being used in police stations.
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Introduced in the fifties, televisions were more accessible than film and made it easier for students to watch videos.
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Handheld calculators made computation fast and easy.
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Scantron tests made grading easier for teachers.
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Personal computers were one of the first steps towards the modern connections we use today.
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iPads were a modern collaboration of an old fashioned slate and personal computer. iPads added a multitude of interactive features to classrooms.
