character: Marie Curie
topic: Frequency Standards in Science
grade: 9
subject: Chemistry
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character: Albert Einstein
topic: Precision Timekeeping Techniques in Physics
grade: 9
subject: Chemistry
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character: Niels Bohr
topic: The Role of Standards in Measurements
grade: 9
subject: Chemistry
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character: Richard Feynman
topic: Advancements in Timekeeping and Measurement Accuracy
grade: 9
subject: Chemistry
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