character: Thomas Edison
topic: The Invention of the Electric Light Bulb and its Impact on Society
grade: 4
subject: Social Studies
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character: Nikola Tesla
topic: Alternating Current and its Role in Electricity Supply
grade: 4
subject: Social Studies
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character: George Westinghouse
topic: Expansion of Electrical Power Systems
grade: 4
subject: Social Studies
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character: Alexander Graham Bell
topic: Invention of the Telephone and Communication Advancements
grade: 4
subject: Social Studies
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