character: Ms. Clara Johnson
topic: Preventing Waterborne Diseases through Chemistry
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Chemical Methods for Water Purification
grade: 12
subject: Chemistry
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character: Mr. John Smith
topic: Environmental Chemistry and Public Health
grade: 12
subject: Chemistry
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character: Professor Linda Torres
topic: The Role of Chemistry in Sanitation and Hygiene
grade: 12
subject: Chemistry
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