character: Mr. Johnson
topic: Understanding the Effects of Heavy Metals on Human Health
grade: 11
subject: Chemistry
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character: Dr. Smith
topic: Heavy Metals: Sources and Prevention
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Toxicology of Common Heavy Metals
grade: 11
subject: Chemistry
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character: Professor Brown
topic: The Role of Chemistry in Environmental Health
grade: 11
subject: Chemistry
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