 Why is it important to watch the ones who don't become physically ill during the conditioning process?
"No specific destination," supplied the man as he punched a key on a small instrument, "Air-lock ahead and to your right. Your body is conditioned to a normal state of free fall, or at best to a state of acceleration." It helps suppress certain physiological reactions to an entirely new set of conditions. They play an important part in our awareness of balance. But even if he could accept the psychologist's authority for the cumulative effect of a gravity system, he could not understand the unspoken warning he felt underlying all that the man said. On the eighth day, two attendants, who showed the effects of massive doses of PON to protect themselves from the centrifugal force, had to carry a man out of the tank.
 Their bodies' familiarity with gravity naturally makes them suspicious
 They could be tapped as leaders for Freedomite missions  It is a sign that they are deviant extraterrestrials  Their bodies' familiarity with gravity naturally makes them suspicious  Their bodies may naturally produce paraoxynebutal