character: John Harrison
topic: Invention of the marine chronometer
grade: 3
subject: Geography
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character: Explorers
topic: Importance of accurate timekeeping in navigation
grade: 3
subject: Geography
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character: Oceanographers
topic: Understanding ocean currents and time measurement
grade: 3
subject: Geography
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character: Scientists
topic: The impact of technology on geography and exploration
grade: 3
subject: Geography
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