character: Dr. Lee
topic: History of Timekeeping Devices
grade: 11
subject: Physics
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character: Galileo Galilei
topic: Invention of the Pendulum Clock
grade: 11
subject: Physics
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character: Christiaan Huygens
topic: Advancements in Mechanical Clocks
grade: 11
subject: Physics
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character: John Harrison
topic: Development of the Marine Chronometer
grade: 11
subject: Physics
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