character: Robert Goddard
topic: Innovations in rocket technology
grade: 6
subject: History
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character: Wernher von Braun
topic: Development of the V-2 rocket
grade: 6
subject: History
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character: Hermann Oberth
topic: Pioneering work in rocketry
grade: 6
subject: History
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character: Konstantin Tsiolkovsky
topic: Theory of space travel
grade: 6
subject: History
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