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Author Nguyen should realize that the altitude at which at which a vehicle finds itself doesn't necessarily determine the state of weightlessness of the occupants. Even if the "Bloon" COULD somehow rise to the altitude of the ISS, the occupants would NOT be weightless! Rather, they would feel their full wight, less a tiny amount because they are farther from center of the Earth than they would be at the surface. Only if the vehicle somehow achieved orbital velocity would the acceleration due to its being in a circular orbit offset the occupants' weight.