The next morning, dressed from the waist down, having washed and shaved, Seldon knocked on the door that led to Dors’s adjoining room and said in a moderate voice, “Open the door, Dors.”

She did. The short reddish-gold curls of her hair were still wet and she too was dressed only from the waist down.

Seldon stepped back in embarrassed alarm. Dors looked down at the swell of her breasts indifferently and wrapped a towel around her head. “What is it?” she asked.

Seldon said, looking off to his right, “I was going to ask you about Wye.”

Dors said very naturally, “About why in connection with what? And for goodness sake, don’t make me talk to your ear. Surely, you’re not a virgin.”

Seldon said in a hurt tone, “I was merely trying to be polite. If you don’t mind, I certainly don’t. And it’s not why about what. I’m asking about the Wye Sector.”

“Why do you want to know? Or, if you prefer: Why Wye?”

“Look, Dors, I’m serious. Every once in a while, the Wye Sector is mentioned—the Mayor of Wye, actually. Hummin mentioned him, you did, Davan did. I don’t know anything about either the sector or the Mayor.”

“I’m not a native Trantorian either, Hari. I know very little, but you’re welcome to what I do know. Wye is near the south pole—quite large, very populous—”

“Very populous at the south pole?”

“We’re not on Helicon, Hari. Or on Cinna either. This is Trantor. Everything is underground and underground at the poles or underground at the equator is pretty much the same. Of course, I imagine they keep their day-night arrangements rather extreme—long days in their summer, long nights in their winter—almost as it would be on the surface. The extremes are just affectation; they’re proud of being polar.”

“But Upperside they must be cold, indeed.”

“Oh yes. The Wye Upperside is snow and ice, but it doesn’t lie as thickly there as you might think. If it did, it might crush the dome, but it doesn’t and that is the basic reason for Wye’s power.”

She turned to her mirror, removed the towel from her head, and threw the dry-net over her hair, which, in a matter of five seconds, gave it a pleasant sheen. She said, “You have no idea how glad I am not to be wearing a skincap,” as she put on the upper portion of her clothing.

“What has the ice layer to do with Wye’s power?”

“Think about it. Forty billion people use a great deal of power and every calorie of it eventually degenerates into heat and has to be gotten rid of. It’s piped to the poles, particularly to the south pole, which is the more developed of the two, and is discharged into space. It melts most of the ice in the process and I’m sure that accounts for Trantor’s clouds and rains, no matter how much the meteorology boggins insist that things are more