Bao’s mother died in a small plane crash, and Bao as the youngest daughter had to go home and take care of things, including possession of the family home. Ultimogeniture in action, modeled on the Hopi matriarchy, he was told. Bao wasn’t sure when she would be back; there was even a chance she wouldn’t be. She was matter-of-fact about it, it was just something that had to be done. Withdrawn already into an internal world. Sax could only wave good-bye to her and walk back to his room, shaking his head. They would understand the fundamental laws of the universe before they had even the slightest handle on society. A particularly obdurate subject of study. He called Michel on screen and expressed something like this, and Michel said, “It’s because culture keeps progressing.”

Sax thought he could see what Michel meant— there were rapid changes in attitudes to many things. Werteswandel, as Bela called it, mutation of values. But they still lived in a society struggling with archaisms of all sorts. Primates banding into tribes, guarding a territory, praying to a god like a cartoon parent. . . . “Sometimes I don’t think there’s been any progress at all,” he said, feeling strangely disconsolate.

“But Sax,” Michel protested, “right here on Mars we have seen both patriarchy and property brought to an end. It’s one of the greatest achievements in human history.”

“If true.”

“Don’t you think women have as much power as men now?”

“As far as I can tell.”

“Perhaps even more, when it comes to reproduction.”

“That would make sense.”

“And the land is in the shared stewardship of everyone. We still own personal items as property, but land as property has never happened here. That’s a new social reality, we struggle with it every day.”

So they did. And Sax remembered how bitter the conflicts had been in the old days, when property and capital had been the order of the day. Yes, perhaps it was true: patriarchy and property were in the process of being dismantled. At least on Mars, at least for now. As with string theory, it might take a long time to work it into any proper state. After all Sax himself, who had no prejudices whatsoever, had been amazed to see a woman mathematician at work. Or, to be more precise, a woman genius. By whom he had been promptly hypnotized, so to speak, along with every other man in the theory group— to the point of being rendered quite distraught by her departure. Uneasily he said, “On Earth people seem to be fighting just as much as before.”

Even Michel had to admit it. “Population pressures,” he said, trying to wave them away. “There are too many people down there, and more all the time. You saw what it was like during our visit. As long as Earth is in that situation, Mars is under threat. And so we fight up here too.”