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Astronaut Mark C. Lee gets his height measured by astronaut Jerry M. Linenger as part of a daily in-flight routine supporting a medical Detailed Supplementary Objective (DSO). Astronaut Richard N. Richards, STS-64 mission commander, looks on in the background. This study was designed to collect information about back pain and height changes experienced by astronauts during flight. Crew members participating in this DSO are required to record height measurements and long back-pain symptoms daily. As an ongoing program, this DSO will gather data from 30 astronauts who spend more than eight consecutive days in space.