character: Nikola Tesla
topic: Alternating Current
grade: 6
subject: Science
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character: Thomas Edison
topic: Direct Current vs. Alternating Current
grade: 6
subject: Science
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character: Guglielmo Marconi
topic: Wireless Communication
grade: 6
subject: Science
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character: Heinrich Hertz
topic: Electromagnetic Waves
grade: 6
subject: Science
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