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His Hand Doesn't Even Move - Crazy free-handed dotted lines by professor in college on a chalk board - YouTube
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Joyful Public Speaking (from fear to joy): How can you easily draw dotted chalk lines on a blackboard?
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The way MIT physics professor Walter Lewin makes these dashed lines on his chalkboard : r/oddlysatisfying
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Professor Writing On The Board While Having A Chalk And Blackboard Lecture High-Res Stock Photo - Getty Images
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