To the men of the future, the scientific goals of today were as incomprehensible as the ancient quest for the Holy Grail! There was a thump. Maitland stirred, came half awake, and opened his eyes. The room was dark except where a broad shaft of moonlight from the open window fell on the foot of his bed. Outside, the residential section of the Reservation slept silently under the pale illumination of the full Moon. He guessed sleepily that it was about three o'clock. What had he heard? He had a d