When Hari Seldon and Dors Venabili were alone, Dors asked thoughtfully, “Are you really planning to see this ‘Mother’ woman?”

“I’m thinking about it, Dors.”

“You’re an odd one, Hari. You seem to go steadily from bad to worse. You went Upperside, which seemed harmless enough, for a rational purpose when you were in Streeling. Then, in Mycogen, you broke into the Elders’ aerie, a much more dangerous task, for a much more foolish purpose. And now in Dahl, you want to go to this place, which that young man seems to think is simple suicide, for something altogether nonsensical.”

“I’m curious about this reference to Earth—and must know if there’s anything to it.”

Dors said, “It’s a legend and not even an interesting one. It is routine. The names differ from planet to planet, but the content is the same. There is always the tale of an original world and a golden age. There is a longing for a supposedly simple and virtuous past that is almost universal among the people of a complex and vicious society. In one way or another, this is true of all societies, since everyone imagines his or her own society to be too complex and vicious, however simple it may be. Mark that down for your psychohistory.”

“Just the same,” said Seldon, “I have to consider the possibility that one world did once exist. Aurora … Earth … the name doesn’t matter. In fact—”

He paused and finally Dors said, “Well?”

Seldon shook his head. “Do you remember the hand-on-thigh story you told me in Mycogen? It was right after I got the Book from Raindrop Forty-Three … Well, it popped into my head one evening recently when we were talking to the Tisalvers. I said something that reminded me, for an instant—”

“Reminded you of what?”

“I don’t remember. It came into my head and went out again, but somehow every time I think of the single-world notion, it seems to me I have the tips of my fingers on something and then lose it.”

Dors looked at Seldon in surprise. “I don’t see what it could be. The hand-on-thigh story has nothing to do with Earth or Aurora.”

“I know, but this … thing … that hovers just past the edge of my mind seems to be connected with this single world anyway and I have the feeling that I must find out more about it at any cost. That … and robots.”

“Robots too? I thought the Elders’ aerie put an end to that.”

“Not at all. I’ve been thinking about them.” He stared at Dors with a troubled look on his face for a long moment, then said, “But I’m not sure.”

“Sure about what, Hari?”

But Seldon merely shook his head and said nothing more.

Dors frowned, then said, “Hari, let me tell you one thing. In sober history—and, believe me, I know what I’m talking about—there is no mention of one world of origin. It’s a popular