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Ongoing studies of microgravity's effects on astronauts are the focus of Liftoff to Learning: Assignment Spacelab!, as the series continues to provide information aimed at students from grades five through twelve. Liftoff to Learning: Assignment Spacelab! looks at a series of experiments conducted by NASA, with some using astronauts and others using rats. The circulatory, musculoskeletal, and neurovestibular systems undergo testing as scientists try to determine the causes of muscle wasting and motion sickness, two conditions that afflict space travelers.