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[–] Fibbideh ago 

NASA loves risk mitigation. They would rather eliminate ANY graphite in the air than just say "eh, the filters should get it all. We will most likely be fine"

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[–] Pawn ago 

Russians didn't bother, and they got to space first..

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[–] Fibbideh ago 

Russians sent a guy up and brought him back down to prove a point. No prolonged missions.