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If humans want to work in the vacuum outside their spaceships they must do it in solid walled cylinders -- if they want to walk on the surface of the moon they will have to do so by means of mechanical or leglike appendages.
---USAF medical opinion, 1953
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Gary Kratochvil American Payload Specialist Astronaut candidate. . Personal: Male. Born in USA. Astronaut Career Astronaut Group: Payload Specialist (Candidate). Entered space service: 15 March 1990.
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