pulsed and throbbed slowly and painfully. He sat up and looked out at the dark landscape, and he knew what was the matter.

Scared, he thought, I'm scared sick.

He'd never known anything like it before in his life, except maybe the time when he was 6 years old and he had climbed to the top of a very high tree when the wind was blowing, and he had been afraid to come down.

It was hitting him, he thought. He was just beginning to understand what this stoppage of machinery really meant, and he wondered if there was something wrong with him that he had not felt it earlier. Was he alone? Had everyone else understood it before he had? Or would it hit them, one by one, just as it was hitting him now, bringing him face to face with what lay ahead.

He knew what had done it. It was his father's expression and his words in the laboratory the night before.

Ken recognized that he had never doubted for an instant that scientists and their tools were wholly adequate to solve this problem in a reasonable time. He had been aware there would be great hardships, but he had never doubted there would be an end to that time. He had believed his father, as a scientist, had the same faith.

It was a staggering shock to learn that his father had no faith in science; a shock to be told that science was not a thing that warranted a man's faith. Ken had planned his whole life around an avid faith in science.

He tried to imagine what the world would be like if no engine should ever run again. The standards of civilized existence would be shattered. Only those areas of the world, where people had never learned to depend on motor transportation or electric power, would be unaffected; those areas of China, India and Africa, where men still scratched the ground with a forked stick and asked only for a cup of rice or grain each day.

This would become the level of the whole world. Until last night, Ken had never believed it remotely possible. Now, his father's words had shaken him out of the certainty that science would avert such consequences. It _could_ happen.

He thought of his own plans and ambitions. There would be no need for scientists, nor the opportunity to become one, in a world of men who grubbed the land with forked sticks. He felt a sudden blind and bitter anger. Even if the disaster were overcome in a matter of years, his opportunity would be 

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