“The manufacture of the smartskin. The trouble is, it has to be nanotechnological …”

Nanotechnologies were still in their infancy. But nanotech, a process that built atom by atom, was the only way to manufacture a material like this, with a complexity that went down below the molecular.

Bisesa smiled. “Can I tell my daughter about this? She’s a modern sort of kid. Nanotech fairy tales are her favorite sort.”

Siobhan sighed. “That’s the trouble. In a story you throw in a handful of magic dust, and nano will build you anything—right? Well, nano will build almost anything, but it needs something to build with, and energy to do it. Nano is more like biology, in some ways. Like a plant, a nano application draws energy and materials from its environment, and uses them to fuel its metabolism, and build itself up.”

“Instead of leaves and trunks, space shields.”

“Yes. In nature metabolic processes are slow. I once saw a bamboo shoot growing at naked-eye speeds: nano is directed, and faster than that. But not much faster.”

Bisesa stroked the bit of smartskin. “So this stuff grows slowly.”

“Too slowly. There aren’t enough factories on the planet for us to churn out the quantity of smartskin we need. We’re stuck.”

“Then ask for help.”

Siobhan was puzzled. “Help?”

“You know, people always think on a big scale—what can the government do for me, how can I gear up industry to churn out what I want? But I learned, working for the UN, that the way the world really works is through ordinary people helping each other, and helping themselves.”

“What are you suggesting?”

Bisesa cautiously picked up the smartskin. “You say this stuff grows like a plant. Well, could I grow it?”

“What?”

“I’m serious. If I put it in my window box, and fed and watered it, and kept it in the sun—”

Siobhan opened her mouth, and closed it. “I don’t know. An open plant pot wouldn’t do, I’m sure of that. But maybe some reasonably uncomplicated kit would work. And maybe the design could be adapted to draw on local nutrients—”

“What does that mean?”

“From the soil. Or even household waste.”

“How would you get it started?”

Siobhan thought. “You’d need some kind of seed, I guess. Enough to encode the construction data, and to bootstrap the macro-scale growth.”

“But if my neighbor grew one, she could pass on seeds to me. And I could pass them on from my, umm, ‘plant’ to the next person.”

“And then you’d need some kind of collection system to bring the finished smartskin to some central point … But wait,” Siobhan said, thinking fast. “The total area of the shield is around a hundred thousand billion square meters. One percent of that, and a global population of ten billion—why, every man, woman, and child on Earth would have to produce, oh, say a blanket ten or twenty meters on a side. Everybody.”

Bisesa grinned. “Surely less than that if the factories do their job. And it isn’t so much. We’ve still got three years. You’d be surprised what Boy Scouts and Girl Guides can produce when they’ve a mind to do it.”

Siobhan shook her head. “This needs thinking through. But if it’s possible I’ll owe you a debt of gratitude.”

Bisesa seemed embarrassed. “It’s an obvious idea. If I hadn’t come up with it, you would have yourself—or somebody else.”

“Maybe.” She smiled. “I ought to introduce you to my daughter.” Saving the world is so 1990s disaster movie! Nobody believes in heroes anymore, Mum … This way, everybody would be a hero, she supposed. Maybe it would catch even Perdita’s imagination.

Bisesa asked, “Why did you show me this stuff?”

Siobhan sighed. “Because this is real. This is engineering. This is what we’re building, right now. I thought if you saw this—”

“It might puncture my fantasies,” Bisesa said.

“Something like that, maybe.”

“Just because something is big, indeed superhuman, doesn’t make it any less real,” Bisesa said evenly. “Or any less relevant. And anyhow, as I’ve said, you don’t have to believe me. Just look for proof.”

Siobhan stood up. “I really ought to get back to my meeting.” But she hesitated, intrigued despite herself. “You know, I’m open-minded enough to accept the existence of extraterrestrial aliens as a possibility. But what you’re describing makes no psychological sense. Why would these hypothetical Firstborn try to destroy us? And even if it were so, why would they give you these hints and glimpses? Why would they warn any of us—and why you? …”

But even as she spoke, Siobhan thought of a possible answer to her objection.

Because there are factions among these Firstborn. Because they are no more united and uniform of view than humanity is—why should a more advanced intelligence be homogeneous? And because there are some of them, at least, who believe that what is being done is wrong. A faction of them, working through this woman, Bisesa, are trying to warn us.

This woman could be crazy, Siobhan thought. Even after meeting her, she was ninety percent sure that was true. But her story did make a certain sense. And what if she was right? What if an investigation did turn up evidence to back her claims? What then?

Bisesa was watching her, as if reading her thoughts. Siobhan didn’t trust herself to speak again, and she hurried away.

When she got back to the Council Room, the level of chatter among the population of heads dropped a little. She stood in the middle of the room and peered around. “You’re all acting as if you’ve got something to be ashamed of.”

Bud said, “Perhaps we have, Siobhan. It’s beginning to look as if things aren’t as black as we painted them. The issue of the solar pressure and positioning—one of us came up with a solution. We think.”

“Who?” Siobhan faced Rose Delea. “Rose. Surely not you.”

Rose actually looked embarrassed. “Actually it was our conversation earlier. When I said something about how we’d have no problem if the sunlight was allowed to pass straight through the shield? It got me thinking. There is a way we could make our shield transparent. We don’t reflect the sunlight. We deflect it …”

The shield would be made clear, but scored on one side with fine parallel grooves: prisms.

“Ah,” Siobhan said. “And each ray of sunlight would be turned aside. We’d be building, not a mirror, but a lens, a huge Fresnel lens.”

It would be an all-but-transparent lens that could turn the sunlight away a little, by only a degree or less. But that would be sufficient to spare the Earth from the blast of the sunstorm. And a lens would suffer only a fraction of the photon pressure of a fully reflective mirror.

Rose said, “It’s really no more of a manufacturing challenge than our current design. But the total mass could be much less.”

“And so we’re back in the realms of feasible design solutions?” Siobhan asked.

“With a vengeance,” Bud said, beaming.

Siobhan glanced around. Now she saw restlessness in their expressions, even eagerness; they were all keen to get back to their people, to begin exploring this new idea. It was a good team, she thought with pride, the best there was, and she could trust them to take this new idea and worry it until it was thoroughly integrated into the design and the construction program—by which time the next obstacle would have appeared, and they would all be back here again.

“Another bit of good news before we close,” she said. “I may have a solution to the nanotech manufacturing problem too.”

Eyes widened.

She smiled. “It will keep. I’ll mail you the details when it’s fleshed out a bit more. Thank you, everybody. Meeting closed.”

The screens winked out, one by one.

“You old ham,” Toby grinned.

“Always leave them wanting more.”