character: George Stephenson
topic: Invention of the Steam Locomotive
grade: 6
subject: Science
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character: Thomas Edison
topic: Electric Railroads and Innovation
grade: 6
subject: Science
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character: The Wright Brothers
topic: Impact of Railroads on Aviation
grade: 6
subject: Science
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character: John D. Rockefeller
topic: Railroads and Economic Growth
grade: 6
subject: Science
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