"In the past few years, about half of the astronauts aboard the international space station have developed an increasing pressure inside their heads, an intracranial pressure that reshapes their optic nerve, causing a significant shift in the eyesight of male astronauts. Doctors call it papilledema. Female space travelers have not been affected."

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Astronaut feels space’s toll on his body – Light Years - CNN.com Blogs

Weiiiiiiiiiiiiird.

Source: CNN
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