Ah, supplemental oxygen—it's a thin safety net up there, not like our hospital cylinders. You calculate flow rates and bottle duration against the brutal math of consumption at extreme effort, but if it runs out above 8000 meters, cerebral hypoxia can dizzy you in minutes, decisions turn slow and fatal. Watching my father's BP medicine cost climb each month, I see it the same: a precise, fragile calculation for survival, and when the supply fails, the consequences are not academic—they come in a quiet, desperate gasp.
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