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Dec14-04, 03:08 PM
Sci Advisor
PF Gold
P: 2,021
The effects of microgravity on human physiology is one of the things being studied on the International Space Station. I'd have to check around to see what the latest data area, but as Monique said, there is a loss of bone mass (very serious concern). Also, muscles weaken from lack of use (something which can be fixed).