This is indeed quite disturbing. Oh well, so well for my hopes aboard the spaceships! I remember reading astronauts with herpes would see aggressive displays of the virus in space. This idea of a lack of gravity causing blood flow issues, a lack of unidirectional flow replaced by the opposite, can be understood and is completely plausible. I think next step for science is to find ways to artificially create a gravitational force. I guess, if you remember those big machines that spin, that spin is enough to get things forced down, and I think that law might just do the trick.
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