character: Nikola Tesla
topic: Alternating Current and Wireless Communication
grade: 8
subject: Social Studies
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character: Thomas Edison
topic: Direct Current vs. Alternating Current
grade: 8
subject: Social Studies
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character: Guglielmo Marconi
topic: Early Wireless Communication Systems
grade: 8
subject: Social Studies
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character: Heinrich Hertz
topic: Discovery of Electromagnetic Waves
grade: 8
subject: Social Studies
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