| 21. | The most fascinating aspect is the illusion of weightlessness in the choreography.
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| 22. | His thinning hair looks even thinner sticking up in weightlessness.
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| 23. | The others will be exposed to weightlessness the usual way.
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| 24. | They will be used to study how living creatures adapt to weightlessness.
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| 25. | The experiments will study the effects of weightlessness on the human body.
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| 26. | Greenleaf studies how astronauts'fluid levels vary in response to weightlessness.
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| 27. | Even Galileo had accepted the weightlessness of air as a simple truth.
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| 28. | Leonov had spent eighteen months undergoing intensive weightlessness training for the mission.
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| 29. | Around apogee the craft experienced about 3 minutes of weightlessness.
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| 30. | The second effect of weightlessness takes place in human fluids.
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