character: Dr. Emily White
topic: Industrial Applications of Polyethylene
grade: 11
subject: Chemistry
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character: Dr. John Smith
topic: Polymer Science in Daily Life
grade: 11
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Chemical Properties of Plastics
grade: 11
subject: Chemistry
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character: Mr. David Lee
topic: Environmental Impact of Polyethylene
grade: 11
subject: Chemistry
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