Yes but why is using trackballs, mice and mini-joysticks such a problem in space (CI No 2,234)? The alliance between the National Aeronautics & Space Administration and PC World to test out new variants aboard the Lockheed KC-135 – known to its friends as the vomit comet because of the effect on the stomach of its 40 steep climbs and free-falls in an hour-long flight that generates 25 seconds of near-weightlessness – because trackballs in zero gravity tend to fly above the sensors underneath, and with IBM Corp’s keyboard-mounted mini-joystick, the TrackPoint, when you push on it in space, you tend to move off in the opposite direction.