 What is the unspoken warning of the psychologist?
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] Rootless and footloose, a man in space can't help but dream of coming home. But something nobody should do is bet on the validity of a homesick dream! Flight Officer Robert Craig surrendered the tube containing his service record tapes and stood waiting while the bored process clerk examined the seal. He felt anxiety as the much-handled card refused for a time to match the instrument's metal contact points. "Los Angeles." "Los Angeles, eh? "No specific destination," supplied the man as he punched a key on a small instrument, "Air-lock ahead and to your right. The knowledge that much of it was motivated by envy soothed him as he clumsily let himself into the lock. "Place your clothing in the receptacle provided and assume a stationary position on the raised podium in the center of the lock." Craig obeyed the robot voice and began reluctantly to remove his flight jacket. It was impossible to hate a robot, but one could certainly hate those who set it into operation. "You will find a red button at your feet. Stepping on the button with his bare foot produced an instant of brilliant blue illumination. "Insert your right arm into the instrument on the central table," commanded the same voice he had heard before. There will be a slight pain, but it is necessary to treat the small injury you have been disregarding." When he withdrew his arm, the scratch was neatly coated with a layer of flesh-colored plastic material. "Well, what's next?" asked Craig somewhat more belligerently than he had intended. "No, but my father—" "Your parents left Terra during the Second Colonization of Cassiopeia II, didn't they?" He was uncomfortable; Wyandotte seemed to know all about him. "Oh, I've landed a few times, even walked around for a while...." "Mr. Craig, I suppose you've guessed that the next step in our little torture system here is psych." Short of Gravitational conditioning, there is nothing to stop you from going to Terra." You have spent eleven years in space. Your body is conditioned to a normal state of free fall, or at best to a state of acceleration." "You were ill, couldn't keep your balance, felt dizzy. That is why all spacemen carry PON, paraoxylnebutal, with them. It helps suppress certain physiological reactions to an entirely new set of conditions.
 The culture on Terra is radically different from the culture in space.
 Even good jobs get boring on Terra.  Private citizens do not enjoy the same rights as spacemen.  The culture on Terra is radically different from the culture in space.  The gravity on Terra could make a spaceman feel sick all the time.