» http://www.mindfully.org/Health/Space-Survival-NG1jan01.htm

Three days on the moon in the final Apollo mission, in 1972, leave astronaut Eugene Cernan weary and filthy with rock dust. A three-year trip to Mars multiplies the hazards of space travel, confronting NASA with a troubling scenario. Imagine a radiation-sick, sleep-deprived astronaut stepping on Mars. Muscle-and-bone-weakened, immune-system-challenged, he faints and breaks a leg. What now, Houston?

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