character: Louis Pasteur
topic: Contributions to Microbiology
grade: 4
subject: Social Studies
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character: Robert Koch
topic: Germ Theory of Disease
grade: 4
subject: Social Studies
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character: Alexander Fleming
topic: Discovery of Penicillin
grade: 4
subject: Social Studies
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character: Joseph Lister
topic: Antiseptic Surgery
grade: 4
subject: Social Studies
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