Long-Term Effects of Weightlessness
MartinBartinFargo writes "The Age has an article detailing the long-term effects of weightlessness on the human body. Stage 1 of the European Space Agency study involved 14 male volunteers spending 3 months carrying out all activities whilst lying on their backs, Stage 2 is currently underway. "
I would suspect that the Russians know a thing or two about this, as they tend to keep their kosmonauts in space much longer than anyone else dares to. However, I can imagine a couple of reasons why they wouldn't be inclined to share their information; long-term weightlessness seems not to be very healthy, and the fact that they have exposed their people to those may not be good for their image.
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Due to circumstances beyond your control, you are master of your fate
and captain of your soul.
Please correct me if I got my facts wrong.