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Moon To Mars
During NEEMO 12, veteran astronaut Heidemarie Stefanyshyn-Piper is shown with a
Psychomotor Vigilance Test (PVT) device. Also visible on the table is a clear bag
for the daily saliva samples, which are used to measure cortisol, a hormone that
provides information on stress levels.
Credit: National Space Biomedical Research Institute
01/14/09

 



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