character: Thomas Edison
topic: Innovations in electric light and power systems
grade: 4
subject: English Language Arts
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character: Nikola Tesla
topic: Alternating current and wireless communication
grade: 4
subject: English Language Arts
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character: Alexander Graham Bell
topic: Invention of the telephone
grade: 4
subject: English Language Arts
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character: Henry Ford
topic: Mass production and the assembly line
grade: 4
subject: English Language Arts
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