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Eventually she pulled herself together and made her way up to the private memorial on the Dawn Wall. She had to greet all those who had been closest to Alex, and give Mqaret a brief rough hug, and withstand the look on his face. But she could see he was not home. This was not like him, but she could fully understand why he might depart. Indeed it was a relief to see it. When she considered how bad she felt, and then how much closer Mqaret had been to Alex than she had been, how much more of his time he spent with her-how long they had been partners-she couldn’t imagine what it would feel like. Or maybe she could. So now Mqaret stared at some other reality, from some other reality-as if extending a courtesy to her. So she could hug him, and promise to visit him later, and then go mingle with the others on the highest terrace of the Dawn Wall, and later make her way to a railing and look down at the city, and out its clear bubble to the black landscape outside it. They were rolling through the Kuiper quadrant, and she saw to the right Hiroshige Crater. Once long before, she had taken Alex out there to the apron of Hiroshige to help with one of her goldsworthies, a stone wave that referenced one of the Japanese artist’s most famous images. Balancing the rock that would be the crest of the breaking wave had taken them a great number of unsuccessful efforts, and as so often with Alex, Swan had ended up laughing so hard her stomach hurt. Now she spotted the rock wave, still out there-it was just visible from the city. The rocks that had formed the crest of the wave were gone, however-knocked down by the vibration of the passing city, perhaps, or simply by the impact of sunlight. Or fallen at the news.

A few days later she visited Mqaret in his lab. He was one of the leading synthetic biologists in the system, and the lab was filled with machines, tanks, flasks, screens bursting with gnarled colorful diagrams-life in all its sprawling complexity, constructed base pair by base pair. In here they had started life from scratch; they had built many of the bacteria now transforming Venus, Titan, Triton-everywhere.

Now none of that mattered. Mqaret was in his office, sitting in his chair, staring through the wall at nothing.

He roused himself and looked up at her. “Oh, Swan-good to see you. Thanks for coming by.”

“That’s all right. How are you doing?”

“Not so well. How about you?”

“Terrible,” Swan confessed, feeling guilty; the last thing she wanted was to add to Mqaret’s load somehow. But there was no point in lying at a time like this. And he merely nodded anyway, distracted by his own thoughts. He was just barely there, she saw. The cubes on his desk contained representations of proteins, the bright false colors tangled beyond all hope of untangling. He had been trying to work.

“It must be hard to work,” she said.

“Yes, well.”

After a blank silence, she said, “Do you know what happened to her?”

He shook his head quickly, as if this was an irrelevance. “She was a hundred and ninety-one.”

“I know, but still…”

“Still what? We break, Swan. Sooner or later, at some point we break.”

“I just wondered why.”

“No. There is no why.”

“Or how, then…”

He shook his head again. “It can be anything. In this case, an aneurysm in a crucial part of the brain. But there are so many ways. The amazing thing is that we stay alive in the first place.”

Swan sat on the edge of the desk. “I know. But, so… what will you do now?”

“Work.”

“But you just said…”

He glanced at her from out of his cave. “I didn’t say it wasn’t any use. That wouldn’t be right. First of all, Alex and I had seventy years together. And we met when I was a hundred and thirty. So there’s that. And then also, the work is interesting to me, just as a puzzle. It’s a very big puzzle. Too big, in fact.” And then he stopped and couldn’t go on for a while. Swan put a hand to his shoulder. He put his face in his hands. Swan sat there beside him and kept her mouth shut. He rubbed his eyes hard, held her hand.

“There’ll be no conquering death,” he said at last. “It’s too big. Too much the natural course of things. The second law of thermodynamics, basically. We can only hope to forestall it. Push it back. That should be enough. I don’t know why it isn’t.”

“Because it only makes it worse!” Swan complained. “The longer you live, the worse it gets!”

He shook his head, wiped his eyes again. “I don’t think that’s right.” He blew out a long breath. “It’s always bad. It’s the people still alive who feel it, though, and so…” He shrugged. “I think what you’re saying is that now it seems like some kind of mistake. Someone dies, we say why. Shouldn’t there have been a way to stop it. And sometimes there is. But…”

“It is some kind of mistake!” Swan declared. “Reality made a mistake, and now you’re fixing it!” She gestured at the screens and cubes. “Right?”

He laughed and cried at the same time. “Right!” he said, sniffing and wiping his face. “It’s stupid. What hubris. I mean, fixing reality.”