The partial and ever-growing list of the harmful effects of weightlessness on the human body includes muscle atrophy, heart shrinkage, heart rhythm irregularities, reduction in blood volume and red cell production, bone mass loss, brain swelling, anemia, endothelial dysfunction, sleep deprivation, kidney stones, space sickness, weakening of the immune system and, most recently discovered, permanently impaired vision. Many observers have noted that prolonged exposure to microgravity is ...


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