character: Ernest Rutherford
topic: Developments in Understanding Radioactivity
grade: 12
subject: History
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character: Marie Curie
topic: Contributions to Radioactivity Research
grade: 12
subject: History
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character: Hans Geiger
topic: Geiger Counter and Detection of Radiation
grade: 12
subject: History
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character: Niels Bohr
topic: The Atomic Model and Its Relation to Radioactivity
grade: 12
subject: History
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