Time loss is a common symptom of close proximity to anti-gravity systems that utilize bends in space and time for the propulsion of UFOs. (TXF: "Dreamland") A residual variation in time can occasionally be detected when transversing areas of space exposed to a UFO. (TXF: "E.B.E.") The effects of such exposure will usually persist within an exposed area until the space-time continuum has fully healed back to its original curvature. (TXF: "E.B.E.", "Dreamland II")