At least they weren't afraid of new things."
"No. I wish they had been. Where is the society of Beforethewars? Destroyed, Doctor! What good were youth and new things? We are better off now. The world is peaceful and jogs along. The race goes nowhere but after all, there is nowhere to go. They proved that. The men who built the road. I will speak with your visitors as I agreed, if they come. But I think I will only ask them to go."
"The race is not going nowhere," said the Astronomer, earnestly. "It is going toward final destruction. My university has a smaller student body each year. Fewer books are written. Less work is done. An old man sleeps in the sun and his days are peaceful and unchanging, but each day finds him nearer death all the same."
"Well, well," said the Industrialist.
"No, don't dismiss it. Listen. Before I wrote you, I investigated your position in the planetary economy."
"And you found me solvent?" interrupted the Industrialist, smiling.
"Why, yes. Oh, I see, you are joking. And yet--perhaps the joke is not far off. You are less solvent than your father and he was less solvent than his father. Perhaps your son will no longer be solvent. It becomes too troublesome for the planet to support even the industries that still exist, though they are toothpicks to the oak trees of Beforethewars. We will be back to village economy and then to what? The caves?"
"And the infusion of fresh technological knowledge will be the changing of all that?"
"Not just the new knowledge. Rather the whole effect of change, of a broadening of horizons. Look, sir, I chose you to approach in this matter not only because you were rich and influential with government officials, but because you had an unusual reputation, for these days, of daring to break with tradition. Our people will resist change and you would know how to handle them, how to see to it that--that--"
"That the youth of the race is revived?"
"Yes."
"With its atomic bombs?"
"The atomic bombs," returned the Astronomer, "need not be the end of civilization. These visitors of mine had their atomic bomb, or whatever their equivalent was on their own worlds, and survived it, because they didn't give up. Don't you see? It wasn't the bomb that defeated us, but our own shell shock. This may be the last chance to reverse the process."
"Tell me," said the Industrialist, "what do these friends from space want in return?"
The Astronomer hesitated. He said, "I will be truthful with you. They come from a denser planet. Ours is richer in the lighter atoms."
"They want magnesium? Aluminum?"
"No, sir. Carbon and hydrogen. They want coal and oil."
"Really?"
The Astronomer said, quickly, "You are going to ask why creatures who have mastered space travel, and therefore atomic power, would want coal and oil. I 

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