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June 7, 2011
Payload specialist James A. (Jim) Pawelczyk (right) monitors an experiment on the off-axis rotator, with astronaut Dafydd (Dave) R. Williams serving as test subject, assisted by Richard M. Linnehan (left). The off-axis rotator which was developed by the European Space Agency (ESA), stimulates the vestibular (balance) system with both spinning and tilting sensations.

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