But by the same token she hoped it would seem impressive to the new arrivals, who showed up right on time for their appointment. They had arrived several hours ago on a passenger capsule launched from Cape Canaveral: long enough for their antinausea meds to kick in and for them to pull themselves together a little bit. It was a small contingent from the Philippines: a scientist who had been working on genetically modified strains of rice, a sociologist who had been working with Filipino sailors who spent their whole lives on cargo freighters—she’d be working with Luisa, presumably—and a pair of Arkies who, judging from looks, were from ethnic groups as different as Icelanders were from Sicilians. One of them was carrying the inevitable beer cooler. As Moira knew perfectly well—for she did this at least once a day—it contained sperm, ova, and embryos collected from donors scattered around the country of origin—in this case, the Philippines. She accepted it with due ceremony, like a Japanese businessman taking another’s business card, and flipped the lid open for inspection. A few chunks of dry ice were still visible on the bottom; good. The finger-sized vials were all contained within a hexagonal cage. She sampled some of them with a pistol-shaped infrared thermometer and verified that none of them had thawed out. Then, after putting on some cotton gloves to protect her skin from the cold, she pulled a few out and spot-checked them just to verify that they had been sealed, labeled, and bar-coded in accordance with the procedures specified in the Third Technical Supplement to the Crater Lake Accord, Volume III, Section 4, Paragraph 11. They had. She’d have expected nothing less from Dr. Miguel Andrada, the geneticist.

She also guessed that Dr. Andrada suspected, at some level, that none of these samples had a snowball’s chance in hell of ever developing into sentient life-forms, but this was not a subject to talk about now. For the benefit of the others, Moira gave a little canned speech, trying to make it sound spontaneous, thanking them and, by extension, the people of the Philippines for having entrusted her and the Cloud Ark with these most precious contributions, and hinting, without promising, at a future in which a cornucopia of vibrant humanity would spring forth from each little plastic vial. It was expected that these people would go forth now to their arklets and text or Facebook the news down to their friends and family at home. The promise in those words was meant to keep people on Earth from getting too rambunctious while they waited for the end; and if that failed, as it had in the case of Venezuela, well, J.B.F. could just nuke them.

“May I see how it all works?” Dr. Andrada asked, after the rest of his delegation had been sent on their way. So it was just the two of them now, hovering in a long, slim docking module that projected to the nadir side. “Below” them its far end was sealed off by a hatch with a keypad. Most of Izzy was open to anyone who wanted to wander in and poke around; they didn’t get a lot of riffraff. But the HGA, the Human Genetic Archive, had a kind of quasi-sacred status and was kept under the digital equivalent of lock and key.

Dr. Andrada was a small, wiry man with prominent cheekbones. Like some other ag geneticists Moira had known, he had a callused, tanned, leathery look, the result of spending a lot of time in experimental plots, digging in actual dirt. Except for a nice pair of eyeglasses he could have passed for a farmer anywhere in Southeast Asia. But he had a Ph.D. from UC Davis and had been on the fast track for a Nobel Prize before the Agent had intervened.

“Of course,” Moira said. “I’d fancy a chat anyway, about how we’re going to grow things other than humans up here.”

“We need to talk about that,” Dr. Andrada agreed.

She drifted down, performing a slow somersault so that she could address the keypad, and punched the button that turned on the iris scanner. After a few moments, the device agreed that she was Dr. Moira Crewe and unlocked the hatch. Bracing herself with a handle on the wall, she pulled it open, then allowed herself to drift through into the docking module beyond. There was barely room in this for both her and Dr. Andrada. White LEDs came on automatically. Clipped to the wall was a simple nylon web belt with a few small electronic gadgets holstered in it. Moira took this and buckled it around her waist.

They had entered through the hatch on the module’s zenith side. To port and starboard were openings that had been sealed off by round plastic shields. Each of these had a handle projecting from its center. The closest to Moira was the one on the port side, so she grabbed the handle, squeezed it to release a latch, and then pulled it out of the way.

Dr. Andrada flinched at the frigid air that washed into the space in its wake. They were looking down a straight tube about ten meters long, large enough for one person to work comfortably, or for two to pass each other if they didn’t mind bumping bodies. Its walls were studded with long neat rows of smaller hatches about as wide as a splayed human hand, each with its own little handle. Hundreds of them. Closer to the entrance these bore neat machine-printed labels and bar codes; farther away they were blank. Next to each one of them was a blue LED; these provided the space’s only illumination.

“Would you like to do the honors?” Moira said.

“If I don’t freeze to death first!” Dr. Andrada said.

“Space is cold,” Moira said. “We rely on that.”

She gave him a minute to put on the cotton gloves, then opened the cooler and held it out. He removed the little rack containing the samples. Moira zapped its bar code with a handheld scanner from her belt. Dr. Andrada pulled himself into the cold storage module and began to drift deeper into it, gingerly prodding the walls in a way that marked him out as a new arrival to zero gravity. “Take the first one that’s unlabeled,” Moira said. “Leave the door open, please.”

Dr. Andrada coughed as the chilly air made his throat spasm. He opened one of the small hatches and slid the sample rack into it. In the meantime Moira was using a handheld printer to generate a sticker identifying the sample in English, in Filipino, and in a machine-readable bar code language. Once Dr. Andrada had returned to the central module, she went up to the open hatch, verified that the sample rack was properly seated in the tubular cavity beyond, then closed the hatch and affixed the sticker to its front. Printed on the hatch was a unique identification number and a bar code conveying the same thing, which she zapped and then double-checked.

The LED next to this hatch had turned red, signaling that the compartment’s temperature was too high. While Moira checked her work, it turned yellow, which suggested the cold was “soaking in.” Later she’d pull it up on the screen of her tablet and verify that it had gone blue.

She flew back out to the docking module and grabbed the round shield that sealed off the cold store. “Now you know what these are for,” she said. “Thermal insulation.” She snapped the shield back into place. “I could open the other one,” she offered, “but you would see the same thing.”

“Thank you anyway,” said Dr. Andrada, “but I have never been so cold in my life!”

They went back “up” to Zvezda and then proceeded forward to the complex of modules where most of the genetic engineering gear was stored. There was nothing to see here but boxes. They could just as easily have gone aft to one of the tori, but Moira knew from experience that new arrivals didn’t benefit from switching back and forth between zero gee and simulated gravity.

Through the nice eyeglasses, Dr. Andrada was giving Moira a look that she read as polite but skeptical. Fair enough. She decided to broach what was probably on his mind. “Forgive me that bit of ceremony,” she said. “I have done it once or twice a day for a year. I’m as much priestess as scientist. You’re meant to blog it, of course. To tell the people down below that you personally hand-carried the samples all the way from Manila to a cold storage location on Izzy.”