Living in space has drastic, negative effects on the brain

Ever since we started seriously thinking about sending humans into space, the question that has immediately followed is, "What will zero-g do to our bodies?" After all, our frames and body functions have evolved to exist within Earth's gravity, not in the weightlessness of space. And now, thanks to astronauts such as Scott Kelly and Peggy Whitson, we know that long-duration spaceflight takes an incredible toll on the body. But what causes these issues and changes? 

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