Breakfast was discouragingly huge — eggs and sausage and cereal, and breads with jams and marmalades, and peanut butter in opened liter cans on every table — and for dessert they spent an hour receiving inoculations. None of them were painful, but from the grins and jokes of the medics Ana knew that they would be later on. And then she lined up with the other two dozen of her detachment in a wet, cold wind, and they were marched off to their various refresher courses in the application of their specialized skills. Ana’s tiny group included the Canadian woman and two men unknown to her, and they wound through the camp streets, past a baseball field and a bowling alley, between barracks and anonymous buildings with armed guards patrolling before them, out into an open field half a kilometer square. In the center of it was a sort of tethered balloon shaped like a sausage, fifty meters long, with guards around the perimeter and three of them grouped before the entrance. There was a fence surrounding the whole thing, and more guards at the gate in the fence; and before any of them were permitted inside, they had to go through the same tedious business of checking IDs one more time.

Off to one side there was a tall chimney coupled to the main tent by a flexible plastic tube. The chimney roared. Though there was no smoke, the shimmering at the top showed that some very hot gases were boiling high into the air out of it. It did not seem to serve any function that Ana could guess. But then, neither did the weapons that all the permanent personnel carried. Who were they meant to be used against? What possible enemy threatened a training base for a scientific expedition which, after all, was in a sense the property of the entire world?

When she finally got through the gates and the guards, she found herself in a long, open shed covered with the opaque white plastic of the bubble. The atmosphere was damp and heavy, filled with strange smells, and the lighting was sultry red. At first she could see very little, but she was aware that people were moving about between rows of what seemed to be smaller, transparent bubbles. The lighting came from a bank of gas-glow tubes, all red, and there was not very much of it.

The guide who had brought her to this place was speaking to her. “Are you all right?”

“Yes, I think so. Why not?”

“Sometimes people can’t stand the smell.”

She sniffed gingerly: pepper and spice and jungle rot. “No, it is fine.”

The Canadian woman said, “Everything sounds funny.”

“There’s positive pressure in the outer shell. Your ears probably popped a little. That’s so that if there’s any air leakage it will all be inward, not out, and of course the air from this chamber gets incinerated at fifteen hundred degrees as it is pumped out — maybe you saw the chimney.”

“One has heard stories of dangerous diseases,” Nan ventured.

“No. There aren’t any. Oh, sure,” the guide went on gloomily, “you can get killed around here. But that’s allergies, not disease, and you’ve all had your shots for them. Dimitrova, you’re for linguistics. You come with me; the rest of you stay right here till I get back.”

He led her through the hothouselike room, past the rows of plastic bubbles. As her eyes became dark-adapted she could see that each of them contained some sort of specimen — mostly plants, and some of them were immense. One towered ten meters, nearly to the top of the shell. It looked like a giant cluster of ferns, and Ana marveled at the money that had been spent to transport that immense mass over the light-years. Apart from the outside roaring of the incinerator, the sounds of pumps, and the noises the people in the shell made, there were sounds she could not identify — a sort of faint, wailing, high-pitched song, and groaning, clattering noises. They came from where she was heading for. The guide said, “Welcome to our zoo.”

And then she saw the balloonist.

She recognized it at once; there could not be another creature as strange as that anywhere in the universe! But it looked… damaged. It was tethered inside a cage. Its great bubble was throbbing but almost limp, sagging against the ground. She stared, fascinated, and saw that a flexible plastic coupling had been taped neatly to a hole in the gasbag, and the plastic line went to a cylinder of gas. A woman with a tape recorder was crouched by the cylinder, adjusting the gas valve as she listened to the balloonist’s plaintive song.

No wonder the voice sounded so faint! He was operating at a fraction of normal pressure, far too little to let him fly, only enough to let him gasp a sobbing sort of song. The woman looked up and said, “You’re Dimitrova? I’m Julia Arden, and this” — pointing at the balloonist—” is Shirley. She’s singing about her childhood right now.”

Ana shook hands courteously, staring at the sad, wrinkled little creature. Those sounds did not seem like language! She could not imagine understanding them, much less translating them, no matter how many times they halved her brain! She said doubtfully, “I will do my best, Mis Arden, but do you think you can really teach me to talk to that?”

“Me? Maybe not. I’ll help, and so will the computers, but the one who’s going to teach you is Shirley herself. She loves to sing to us. Poor thing. She doesn’t have much else to do with her time, does she?”

Nan looked at the creature for a moment and then burst out, “No, but what a shame, really! Can you not see she is in pain?”

The other woman shrugged. “What do you want me to do about it?” Her tone was less hostile than defensive. “I don’t suppose Shirley volunteered for this duty, but then, neither did I. Your job is learning her language, Dimitrova, and let’s get on with it.”

“But to see a creature in pain—”

Julia Arden laughed and then shook her head. “Sweetie, you only got here last night. Wait a day or two. Then you can talk to me about pain.”

From 0700 to 1100 Ana Dimitrova stretched the muscles of her mind until she thought she would die of it, and from 1200 to 1630 she balanced the diet by doing the same to her body.

Julia Arden had been right. Within forty-eight hours Ana was an expert on pain. She woke up each morning with a hazy overcast of brightness that she knew was the foretaste of migraine. She went to bed each night with so many aches, throbs, and bruises that it took all the will she had to refrain from swallowing the pills they had given her. She could not afford pills. She needed her mind alert, even while she slept, because sleeping was only another kind of study for Ana, with the taped calls of the balloonists murmuring under her pillow all night long.

The headaches, all right — they were something she was used to. Worse than that, the shots were producing their effect. Her skin was covered with little blisters and bumps, some that itched, some that were tender, some downright painful every moment of time. Not just pain. She wheezed and coughed. Her eyes ran uninterruptedly, and so did her nose. She was not alone; everyone in her group was having the same reaction to the allergy shots. If this was the prophylaxis, what could the illness itself be like? And then she saw the holos of the unfortunate Peeps who had died of their reactions before the countermeasures had been developed, and they defined for her the difference between prophylaxis and reality. It was not comforting to her. It was terrifying! How had Ahmed fared in all this? He had said nothing in his letters, but perhaps he was only being brave.

And every afternoon — feel well, feel ill, no matter — there she was out on the exercise field. Push-ups and five-hundred-meter runs, obstacle courses and rope climbing. Her hands were raw, then blistered, then calloused. Even through the coveralls her knees were scraped bloody. Everywhere on arms and legs where there was not a pimple or a blister, there was a bruise.