To be sure, in the last four centuries, turmoil had increased somehow and there had been a rash of Imperial assassinations and takeovers. But even that was calming down and right now the Galaxy was as quiet as it had ever been. Under Cleon I and before him under his father, Stanel VI, the worlds were prosperous-and Cleon himself was not considered a tyrant. Even those who disliked the Imperium as an institution rarely had anything truly bad to say about Cleon, much as they might inveigh against Eto Demerzel. Why, then, should Hummin say that the Galactic Empire was dying-and with such conviction?

Hummin was a journalist. He probably knew Galactic history in some detail and he had to understand the current situation in great detail. Was it this that supplied him with the knowledge that lay behind his statement? In that case, just what was the knowledge?

Several times Seldon was on the point of asking, of demanding an answer, but there was something in Hummin’s solemn face that stopped him. And there was something in his own ingrained belief that the Galactic Empire was a given, an axiom, the foundation stone on which all argument rested that prevented him too. After all, if that was wrong, he didn’t want to know. No, he couldn’t believe that he was wrong. The Galactic Empire could no more come to an end than the Universe itself could. Or, if the Universe did end, then-and only then-would the Empire end.

Seldon closed his eyes, attempting to sleep but, of course, he could not. Would he have to study the history of the Universe in order to advance his theory of psychohistory?

How could he? Twenty-five million worlds existed, each with its own endlessly complex history. How could he study all that? There were book-films in many volumes, he knew, that dealt with Galactic history. He had even skimmed one once for some now-forgotten reason and had found it too dull to view even halfway through.

The book-films had dealt with important worlds. With some, it dealt through all or almost all their history; with others, only as they gained importance for a time and only till they faded away. He remembered having looked up Helicon in the index and having found only one citation. He had punched the keys that would turn up that citation and found Helicon included in a listing of worlds which, on one occasion, had temporarily lined up behind a certain claimant to the Imperial throne who had failed to make good his claim. Helicon had escaped retribution on that occasion, probably because it was not even sufficiently important to be punished.

What good was such a history? Surely, psychohistory would have to take into account the actions and reactions and interactions of each world-each and every world. How could one study the history of twenty-five million worlds and consider all their possible interactions? It would surely be an impossible task and this was just one more reinforcement of the general conclusion that psychohistory was of theoretical interest but could never be put to any practical use. Seldon felt a gentle push forward and decided that the air-taxi must be decelerating.

“What’s up?” he asked.

“I think we’ve come far enough,” said Hummin, “to risk a small stopover for a bite to eat, a glass of something or other, and a visit to a washroom.”

And, in the course of the next fifteen minutes, during which the air-taxi slowed steadily, they came to a lighted recess. The taxi swerved inward and found a parking spot among five or six other vehicles.

Hummin’s practiced eye seemed to take in the recess, the other taxis, the diner, the walkways, and the men and women all at a glance. Seldon, trying to look inconspicuous and again not knowing how, watched him, trying not to do so too intently.

When they sat down at a small table and punched in their orders, Seldon, attempting to sound indifferent, said, “Everything okay?”

“Seems so,” said Hummin.

“How can you tell?”

Hummin let his dark eyes rest on Seldon for a moment. “Instinct,” he said. “Years of news gathering. You look and know, ‘No news here.’ ”

Seldon nodded and felt relieved. Hummin might have said it sardonically, but there must be a certain amount of truth to it. His satisfaction did not last through the first bite of his sandwich. He looked up at Hummin with his mouth full and with a look of hurt surprise on his face.

Hummin said, “This is a wayside diner, my friend. Cheap, fast, and not very good. The food’s homegrown and has an infusion of rather sharp yeast. Trantorian palates are used to it.”

Seldon swallowed with difficulty. “But back in the hotel-”

“You were in the Imperial Sector, Seldon. Food is imported there and where microfood is used it is high-quality. It is also expensive.”

Seldon wondered whether to take another bite. “You mean that as long as I stay on Trantor-”

Hummin made a hushing motion with his lips. “Don’t give anyone the impression that you’re used to better. There are places on Trantor where to be identified as an aristocrat is worse than being identified as an Outworlder. The food won’t be so bad everywhere, I assure you. These wayside places have a reputation for low quality. If you can stomach that sandwich, you’ll be able to eat anywhere on Trantor. And it won’t hurt you. It’s not decayed or bad or anything like that. It just has a harsh, strong taste and, honestly, you may grow accustomed to it. I’ve met Trantorians who spit out honest food and say it lacks that homegrown tang.”

“Do they grow much food on Trantor?” asked Seldon. A quick side glance showed him there was no one seated in the immediate vicinity and he spoke quietly. “I’ve always heard it takes twenty surrounding worlds to supply the hundreds of freight ships required to feed Trantor every day.”

“I know. And hundreds to carry off the load of wastes. And if you want to make the story really good, you say that the same freight ships carry food one way and waste the other. It’s true that we import considerable quantities of food, but that’s mostly luxury items. And we export considerable waste, carefully treated into inoffensiveness, as important organic fertilizer-every bit as important to other worlds as the food is to us. But that’s only a small fraction of the whole.”

“It is?”

“Yes. In addition to fish in the sea, there are gardens and truck farms everywhere. And fruit trees and poultry and rabbits and vast microorganism farms-usually called yeast farms, though the yeast makes up a minority of the growths. And our wastes are mostly used right here at home to maintain all that growth. In fact, in many ways Trantor is very much like an enormous and overgrown space settlement. Have you ever visited one of those?”

“Indeed I have.”

“Space settlements are essentially enclosed cities, with everything artificially cycled, with artificial ventilation, artificial day and night, and so on. Trantor is different only in that even the largest space settlement has a population of only ten million and Trantor has four thousand times that. Of course, we have real gravity. And no space settlement can match us in our microfoods. We have yeast vats, fungal vats, and algae ponds vast beyond the imagination. And we are strong on artificial flavoring, added with no light hand. That’s what gives the taste to what you’re eating.”

Seldon had gotten through most of his sandwich and found it not as offensive as the first bite had been. “And it won’t affect me?”

“It does hit the intestinal flora and every once in a while it afflicts some poor Outworlder with diarrhea, but that’s rare, and you harden even to that quickly. Still, drink your milkshake, which you probably won’t like. It contains an antidiarrhetic that should keep you safe, even if you tend to be sensitive to such things.”