started marking the images, studying the molecules and flagging what looked like key identifiers, separating them into subgroups, teaching the medicomp how to recognize the different pieces. Soon it was flying through the list on its own, dividing the compounds into nine major types with a tenth group of unconnected outliers. It still offered no hint as to their function, and Kira couldn’t discern one by looking at them. Whatever they were, Samm’s body was full of them.
None of the compounds were remotely as complex as the Lurker, but they still didn’t match with any substance Kira was familiar with — not fabric, not food, obviously not mineral or plastic. She looked over at him, then back at the screen, then pursed her lips and stood up. They were too common and consistent to be accidental, so they obviously had a purpose, and his body would need creation or receptor sites to take advantage of that purpose. Perhaps this had something to do with their resistance? There was only one way to find out. She walked to the table, unlocked the wheels, and started pushing it across the room. She expected Samm to ask what she was doing, but he stayed perfectly quiet.
She pulled him to a stop at the DORD scanner, a heavy machine nearly as big as some of the cars out rusting in the parking lot. This was the big gun in her laboratory arsenal: a medical scanner that could catalog an entire body, layer by layer and piece by piece. She hit a switch to turn it on, then crossed back to the medicomp while it booted up. The definitions she’d created for the categories of compounds were still there, along with several of the clearest images, and she froze them to the screen before sliding the screen out, disconnecting it from the medicomp, and carrying it carefully to the DORD. The screen had an impressive amount of computing power all on its own, but it was nothing compared to the sensor systems it could attach to. She slid it into the DORD, hearing the click as it locked into place, and a few quick finger taps later the machine was ready to go. The DORD would scan Samm’s lungs, throat, and nasal passages for anything resembling the mysterious compounds, which would give her a good idea of where they came from and where they went. She’d have to intuit the rest from there. Kira raised the sensor array, swung it out, and centered Samm beneath it; it was a thick, heavy piece of equipment in a white plastic shell, easily the heaviest thing in the room, but it held its own weight perfectly. She tapped start, and the DORD whirred to life.
Kira watched the screen closely, eager to see what the scan turned up. It was not a quick scan. She drummed her fingers nervously on the DORD housing, then turned and walked to the window; she wanted to ask Samm if he knew what the particles were, despite his refusal to talk, but now that the scan had started, any significant motion would upset it. She turned again and watched him, steady as a rock, almost as if he were holding still on purpose.
She saw motion on the screen and ran to check it; the DORD was already displaying and categorizing some preliminary images. She flipped through the list and opened one for the compound labeled M, a funny little horseshoe-shaped particle. The DORD had found several structures in Samm’s body that it thought might be related to it: one in the nasal cavity and the rest in the lungs. Kira pulled them up, side by side on the screen, and studied them; they looked almost like glands, though not any glands Kira was familiar with. The one in his sinuses was significantly larger, and the DORD had cross-linked it to several other files. Kira opened the list and flipped through it quickly, mildly surprised at what she saw; the DORD had linked that image to every compound it had scanned for thus far. They each had a little gland of their own in the lungs, but they were all connected to the big one in his head.
Kira studied the gland closer while the DORD kept working. What did it do? She couldn’t just ask the computer to guess, but she could ask it to search its database for partial matches. She started the search and looked back at the image again, buckling down for another long wait, but the results were almost instantaneous: no match. She frowned and ran the test again. No match.
Samm had an incredibly sophisticated pheromonal system.
Kira pulled up more files, reading what she could on pheromones: They were a system of simple chemical communication, like a form of smell but far, far more specialized. Insects used them for simple things like marking trails or warning one another of danger; dogs used them to claim territory and to signal breeding times. What did the Partials use them for?
No response.
“Can’t blame me for trying.” She thought a moment, looking around the room, then opened the medicomp and pulled out the rubber glove Samm had breathed into. She brought it near his face, pricked it with a pin, and squeezed it as hard as she could, propelling the air directly into Samm’s nose. He coughed and spluttered, jerking his head to get out of the stream of air, but Kira watched in wonder as his demeanor seemed to grow more calm — his heart rate rose as he reacted to the forced air, then fell again almost immediately as he reacted to … something else. The pheromones. His eyes relaxed, his expression softened, his breathing became more even.
He seemed, Kira thought suddenly, like he was making exactly the same face he’d made in the morning, when he’d agreed to blow into the glove.
“Kuso,” he said. “That’s not fair.”
Kira put her hands on her hips. “What just happened?”
“You’re using my own data against me, and now I — damn it.” He closed his mouth and looked at the ceiling.
“What data?” asked Kira. “The pheromones? Is that what you call them?” She looked at the glove in her hand, now deflated and floppy. “You just told me something you didn’t want to tell me, didn’t you? You’ve never done that — this was a slip. What did the pheromones do?”
Samm said nothing, and Kira brought the glove closer to her face, examining it closely. She walked to the center of the room, envisioning the way it had been laid out that morning — the DORD over here, the table over there, and Samm on top of it. She’d asked him to breathe into the glove and they’d shared something, a moment of … of something. Of actual communication. She’d made a joke about his name, he’d made one back, and then he’d agreed to help her collect a breath sample. He’d trusted her.
And then just now, after she blew it back in his face and asked him a question, he’d trusted her again — not for long, but long enough for his shield of hostile self-control to falter. He’d answered her question.
The pheromones had re-created the trust he’d felt that morning and forced him to feel it again.
“It’s like a chemical empathy system,” she said softly, walking back toward Samm. “Whatever you’re feeling, you broadcast with these pheromones, so that other Partials can feel it too. Or, at least know that you’re feeling it.” She sat in the chair next to him. “It’s like the social yawn: You can standardize one person’s emotional state across an entire group.”
“You can’t use it against me anymore,” said Samm. “I’m not breathing into your gloves.”
“I’m not trying to use it against you, I’m trying to understand it. What does it feel like?”
Samm turned to look at her. “What does hearing feel like?”
“Okay,” said Kira, nodding, “that was a stupid question, you’re right. It’s doesn’t feel like anything, it’s just part of who you are.”
“I’d forgotten that humans couldn’t link,” said Samm. “All this time I’ve been so confused, trying to figure out why you were all so melodramatic about everything. It’s because you can’t pick up each other’s emotions from the link, so you have to broadcast them through voice inflection and body language. It’s helpful, I’ll admit, but it’s kind of … histrionic.”
“Histrionic?” Kira asked. It was the single longest speech she’d ever heard him give. Was he talking openly, or was this more of his calculated planning? What did he have to gain by talking? She kept going, trying to draw out the conversation and see if he’d keep talking. “If you depend on chemical triggers to tell people how you’re feeling,” she said, “that explains a lot about you, too. You don’t display nearly enough emotion for human society; if we seem
