The orphaned Riedel was raised by his grandmother in Bernstadt.
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While in Berlin, he attended a public lecture on rocketry by Rudolf Nebel on behalf of Germany's amateur rocket group, the Verein für Raumschiffahrt (VfR - "Spaceflight Society") and joined the group straight away, becoming very active in its efforts to build a working rocket that resulted in the Mirak and Repulsor rockets, providing his family's farm as a testing ground.
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