character: James Watson
topic: DNA Structure
grade: 4
subject: History
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character: Francis Crick
topic: Discovery of DNA Double Helix
grade: 4
subject: History
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character: Rosalind Franklin
topic: X-ray Diffraction and DNA
grade: 4
subject: History
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character: Maurice Wilkins
topic: Collaboration in DNA Research
grade: 4
subject: History
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