family; and over and over again, it ignored her.)
Ada wondered if other members of the lab felt the same way. She would never have told David; although he found ELIXIRâs growing intelligence an increasingly interesting philosophical inquiry, he seemed to be completely objective about the program. He did not indulge much in the tendency the other members of the lab had to anthropomorphize ELIXIR. He chuckled at the Santa hat placed on the mainframeâs monitor at Christmastime; he laughed aloud when Frank, taking lunch orders, shouted across the room to request the machineâs. But Ada could tell that his ambitions were greater, that he was focused on a distant horizon that lay beyond anything ELIXIR could possibly navigate at the time. The machine, to him, was still a machine, and the little visual puns constructed by the members of the lab were pranks and gimmicks. In Davidâs mind, it would take years and years of progress before ELIXIR achieved anything resembling true intelligence.
In the meantime, the lab presented conference papers at the IJCAI and the AAAI. They published scholarly articles in Computing . From time to time, an article appeared in a popular magazine like Atlantic Monthly or Newsweek about ELIXIR. David took no pleasure in this, avoiding the reporter, always sending another member of the lab to represent the group. He was famously camera-shy and would neverlet his picture be taken, even by Ada; the only recent image of her father that she had was one on an old photo ID that she had swiped from him when the system changed. In it, David looked at the camera askance, wincing, as if staring into a very bright light. With these publications, he cooperated only out of a sense of obligation to the Bit, because the publicity was helpful for generating funds. A laudatory article in Time was published in 1980, detailing the ambitions of the Steiner Lab; in the photograph, a smiling Hayato posed with his palm on the top of the monitor on which they chatted with ELIXIR: a proud father placing a protective hand on his child. David had refused the coverage, as usual, thrusting the other members of the lab forward, receding into the background himself.
Together, the members of the Steiner lab were generally reserved in their predictions about what ELIXIR could accomplish. They were self-disparaging and disparaging, too, of the program, whom they benevolently insulted, almost as sport. (Ada, who had grown fond of ELIXIR, was displeased by this; she felt it was somehow disloyal.)
But sometimes, when it was just Ada and David alone, he allowed himself to rhapsodize about the future of the beast, as he affectionately called ELIXIR from time to time, and he encouraged her to do so as well.
âWhat is the end result of a program like this one?â he asked Ada.
She studied his face, looking for hints.
âA companion?â she asked. âAn assistant?â
âPossibly,â said David, but he looked at her, always, as if waiting for more.
O n Saturday, August 11, 1984, Ada woke up to find David missing. She knew he was gone as soon as she woke up: normally she could sense his presence in the house from the small noises he made, his constant movement, the vibration of the floor from a jittering leg. But that morning there was a foreign stillness to the house, a quietness that made her think, at first, that she was someplace else.
Despite this, her first notion was to look all over the house for him. Once, when she had thought he was out, sheâd stumbled upon him in the basement, with industrial noise-canceling headphones on, working on an experiment that, heâd said, required his full concentration. But this time Ada did not find him.
There was no note. His car was still in the driveway. She searched for his keys and his wallet; the former she found, the latter she did not see. This meant, she presumed, that he had gone out on some errand, but had not intended to stay for long.
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