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Learning Curve

1972: Scantron.

Marketplace Contributor May 14, 2014
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A test-grading Get Out of Jail Free card for teachers. Students fill in the little ovals on multiple-choices tests. A scanning machine measures the amount of light passing through a sheet, and voila the test is marked. Once cheap Scantrons  made their way into classrooms, automated testing became a school room standard. The tests also gave the No.2  pencil a place in history.  

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