character: John Snow
topic: Historical Advances in Water Filtration Techniques
grade: 11
subject: Chemistry
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character: Dr. John Snow
topic: Contribution to Epidemiology and Water Safety
grade: 11
subject: Chemistry
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character: Thames Water
topic: Evolution of Water Filtration in the 19th Century
grade: 11
subject: Chemistry
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character: Louis Pasteur
topic: Microbiology's Role in Water Purification
grade: 11
subject: Chemistry
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