character: Professor Timeline
topic: The History of Timekeeping Devices
grade: 6
subject: Geography
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character: Professor Clockwise
topic: Mechanical Clocks and Their Evolution
grade: 6
subject: Geography
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character: Professor Sundial
topic: The Use of Sundials in Ancient Civilizations
grade: 6
subject: Geography
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character: Professor Atomic
topic: The Precision of Atomic Clocks
grade: 6
subject: Geography
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