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Learning Curve
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Learning Curve
1940: Ballpoint Pen.
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May 14, 2014
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Learning Curve
1943: Mimeograph.
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May 14, 2014
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Learning Curve
1930: Overhead Projector.
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May 14, 2014
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Learning Curve
1925: Film Projector.
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May 14, 2014
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Learning Curve
1920s: Radio.
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May 14, 2014
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Learning Curve
1905: Stereoscope.
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May 14, 2014
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Learning Curve
1924: Teaching Machine.
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May 14, 2014
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Learning Curve
1801: Pencils.
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May 13, 2014
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Learning Curve
1801: Chalk Board.
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May 13, 2014
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Learning Curve
1870: Magic Lantern.
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May 13, 2014
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