 What has conditioning done to the characters?
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] When nobody aboard ship remembers where it's going, how can they tell when it has arrived? Every day for a week now, Rikud had come to the viewport to watch the great changeless sweep of space. He could not quite explain the feelings within him; they were so alien, so unnatural. But ever since the engines somewhere in the rear of the world had changed their tone, from the steady whining Rikud had heard all twenty-five years of his life, to the sullen roar that came to his ears now, the feelings had grown. Instead, there was more of the blackness, and one very bright star set apart by itself in the middle of the viewport. "In five more years," the older man chided, "you'll be ready to sire children. But it came again, and each time it left him with a feeling he could not explain. Rikud knew that something which he could not explain had entered the elder man's head for a moment, but it had departed almost before Chuls knew of its existence. Perhaps two score men lay about, naked, under the ray tubes. Rikud, for his part, wanted to get back to the viewport and watch the one new bright star. Now why shouldn't a man be permitted to do what he wanted, when he wanted to do it? Once, here in this same ray room, he had had the impulse to hurl himself head-first against the wall, just to see what would happen. But something soft had cushioned the impact—something which had come into being just for the moment and then abruptly passed into non-being again, something which was as impalpable as air. Rikud had been stopped in this action, although there was no real authority to stop him.
 It has become a way of life for them. Without the buzzer, their life as they know it ceases to exist.
 It has kept them in shape, both mentally and physically,  and ready to face the struggles they encounter.  Nothing.  They were left to their own devices for so long that they abandoned any notion.  It has made them fear one another.  It has become a way of life for them. Without the buzzer, their life as they know it ceases to exist.