Medicine and the moon flight.
D002940:Circadian Rhythm; D003672:Defecation; D018504:Ecological Systems, Closed; D006801:Humans; D008297:Male; D010827:Physiology; D012141:Respiratory Tract Infections; D012890:Sleep; D013026:Space Flight; D013312:Stress, Physiological; D013696:Temperature; D014893:Weightlessness