"Three. But we only saw two. I guess one was hiding." He shook his head. "You know, one of the swarms had become like a pet to her. It was smaller than the others. It'd wait for her to come outside, and it always stuck close to her. Sometimes when she came out it swirled around her, like it was excited to see her. She'd talk to it, too, like it was a dog or something." I pressed my throbbing temples. "She talked to it," I repeated. Jesus Christ. "Don't tell me the swarms have auditory sensors, too."
"No. They don't."
"So talking was a waste of time."
"Uh, well ... we think the cloud was close enough that her breath deflected some of the particles. In a rhythmic pattern."
"So the whole cloud was one giant eardrum?"
"In a way, yeah."
"And it's a net, so it learned ..."
"Yeah."
I sighed. "Are you going to tell me it talked back?"
"No, but it started making weird sounds."
I nodded. I'd heard those weird sounds. "How does it do that?"
"We're not sure. Bobby thinks it's the reverse of the auditory deflection that allows it to hear. The particles pulse in a coordinated front, and generate a sound wave. Sort of like an audio speaker."
It would have to be something like that, I thought. Even though it seemed unlikely that it could do it. The swarm was basically a dust cloud of miniature particles. The particles didn't have either the mass or the energy to generate a sound wave.
A thought occurred to me. "David," I said, "was Julia out there yesterday, with the swarms?"
"Yes, in the morning. No problem. It was a few hours later, after she left, that they killed the snake."
"And was anything killed before that?"
"Uh ... possibly a coyote a few days ago, I'm not sure."
"So maybe the snake wasn't the first?"
"Maybe ..."
"And today they killed a rabbit."
"Yeah. So it's progressing fast, now."
"Thank you, Julia," I said.
I was pretty sure the accelerated behavior of the swarms that we were seeing was a function of past learning. This was a characteristic of distributed systems-and for that matter a characteristic of evolution, which could be considered a kind of learning, if you wanted to think of it in those terms. In either case, it meant that systems experienced a long, slow starting period, followed by ever-increasing speed.
You could see that exact speedup in the evolution of life on earth. The first life shows up four billion years ago as single-cell creatures. Nothing changes for the next two billion years. Then nuclei appear in the cells. Things start to pick up. Only a few hundred million years later, multicellular organisms. A few hundred million years after that, explosive diversity of life. And more diversity. By a couple of hundred million years ago there are large plants and animals, complex creatures, dinosaurs. In all this, man's a latecomer: four million years ago, upright apes. Two million years ago, early human ancestors. Thirty-five thousand years ago, cave paintings. The acceleration was dramatic. If you compressed the history of life on earth into twenty-four hours, then multicellular organisms appeared in the last twelve hours, dinosaurs in the last hour, the earliest men in the last forty seconds, and modern men less than one second ago. It had taken two billion years for primitive cells to incorporate a nucleus, the first step toward complexity. But it had taken only 200 million years-one-tenth of the time-to evolve multicellular animals. And it took only four million years to go from small-brained apes with crude bone tools to modern man and genetic engineering. That was how fast the pace had increased.
This same pattern showed up in the behavior of agent-based systems. It took a long time for agents to "lay the groundwork" and to accomplish the early stuff, but once that was completed, subsequent progress could be swift. There was no way to skip the groundwork, just as there was no way for a human being to skip childhood. You had to do the preliminary work. But at the same time, there was no way to avoid the subsequent acceleration. It was, so to speak, built into the system.
Teaching made the progression more efficient, and I was sure Julia's teaching had been an important factor in the behavior of the swarm now. Simply by interacting with it, she had introduced a selection pressure in an organism with emergent behavior that couldn't be predicted. It was a very foolish thing to do.
So the swarm-already developing rapidly-would develop even more rapidly in the future. And since it was a man-made organism, evolution was not taking place on a biological timescale. Instead, it was happening in a matter of hours.
Destroying the swarms would be more difficult with each passing hour. "Okay," I said to David. "If the swarms are coming back, then we better get ready for them." I got to my feet, wincing at the headache, and headed for the door. "What do you have in mind?" David said.
"What do you think I have in mind?" I said. "We've got to kill these things cold stone dead. We have to wipe them off the face of the planet. And we have to do it right now." David shifted in his chair. "Fine with me," he said. "But I don't think Ricky's going to like it."
"Why not?"
David shrugged. "He's just not."
I waited, and said nothing.
David fidgeted in his chair, more and more uncomfortable. "The thing is, he and Julia are, uh, in agreement on this."
"They're in agreement."
"Yes. They see eye to eye. I mean, on this."
I said, "What are you trying to say to me, David?"