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Mark Olson
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Science Fiction & Fantasy 30,804 rep 7 gold badges121 silver badges138 bronze badges
Worldbuilding 13,993 rep 1 gold badge37 silver badges53 bronze badges
Astronomy 7,320 rep 17 silver badges27 bronze badges
History 5,262 rep 1 gold badge18 silver badges23 bronze badges
Space Exploration 371 rep 2 silver badges4 bronze badges

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