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One of the things I read in a sci-fi book was that we need to be able to create our own artifical horizon, so we don't get too disoriented by zero gravity. Besides giving a nice view, being able to reference the earth as being "down" may help psychologically.
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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