Anything you can Do by Randall Garrett — Read

The girl moved with the peculiar gliding walk so characteristic of a person walking under low-gravity conditions, and the ease and grace with which she did it showed that she was no stranger to low-gee. To the three men from Earth who followed her a few paces behind, the gee-pull seemed so low as to be almost nonexistent, although it was actually a shade over one quarter of that of Earth, the highest gravitational pull of any planetoid in the Belt. Their faint feeling of nausea was due simply to their lack of experience with _really_ low gravity -- the largest planetoid in the Belt had a surface gravity that was only one eighth of the pull they were now experiencing, and only one thirty-second of the Earth gravity they were used to.

The planetoid they were on -- or rather, _in_ -- was known throughout the Belt simply as Threadneedle Street, and was nowhere near as large as Ceres. What accounted for the relatively high gravity pull of this tiny body was its spin. Moving in its orbit, out beyond the orbit of Mars, it turned fairly rapidly on its axis -- rapidly enough to overcome the feeble gravitational field of its mass. It was a solid, roughly spherical mass of nickel-iron, nearly two thirds of a mile in diameter and, like the other inhabited planetoids of the Belt, honeycombed with corridors and rooms cut out of the living metal itself. But the corridors and rooms were oriented differently from those of the other planetoids; Threadneedle Street made one complete rotation about its axis in something less than a minute and a half, and the resulting centrifugal force reversed the normal "up" and "down", so that the center of the planetoid was overhead to anyone walking inside it. It was that fact which added to the queasiness of the three men from Earth who were following the girl down the corridor. They knew that only a few floors beneath them yawned the mighty nothingness of infinite space.