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one."
    Gordon studied the third x-y output sheet. On this one there was a reasonably clear peak on the left side, at low frequencies, and then noise to the fight. "I don't get it."
    "I sure don't either."
    "We've always got flat, constant noise before."
    "Yep." Cooper looked at him blankly. Gordon was the professor here; Cooper was tossing the riddle over to him.

    Gordon squinted, thinking. "We're getting the peaks, but only part of the time."
    "That's what it looks like."
    "'Time. Time," Gordon muttered distantly. "Hey, the pen takes about, say, thirty seconds to move across the sheet, right?"
    "Well, we could change that, if you think–"
    "No, no, listen," Gordon said rapidly. "Suppose the noise isn't always there? In this one—" he shuffled back to the second sheet "–there was some source of noise when the pen was recording the low frequencies.
    About ten seconds later it vanished. Here— " he planted a stubby finger on the third x-y graph. "–the hash started in as the pen reached high frequencies. The noise was returning."
    Cooper wrinkled his brow. "But ... I thought this was a steady state experiment. I mean, nothing changes, that's the whole point. We keep the temperature low but constant. The scopes and amps and rectifiers are all warmed up and holding to pattern. They–"
    Gordon waved him into silence. "It's nothing we are doing. We've spent weeks checking the electronics; that's not malfunctioning. No, it's something else, that's my point."
    "But what?"
    "Something from outside. Interference."
    "How could-"
    "Who knows?" Gordon said with new energy. He began his characteristic nervous pacing. His shoe soles squeaked on the floor at every turn. "What's happening is, there's another source of signal in the indium antimonide. Or else the indium is picking up a time-varying input from outside the lab."
    "I don't understand."
    "Hell, I don't either. But something's screwing up the nuclear resonance detection. We've got to track it down."
    Cooper squinted at the erratic lines, as though measuring in his mind's eye the alterations that had to be made to study the problem further.
    "How?"
    "If we can't remove the noise, study it. Find out what it's coming from.
    Is it occurring in all the indium antimonide samples? Does it filter in from some other lab here? Or is it something new? That sort of thing."

    Cooper nodded slowly. Gordon framed a few quick circuit diagrams on the back of one of the sheets, sketching in the components with a pencil.
    He could see fresh possibilities now. An adjustment here, a new piece of equipment there. They could borrow some components from Lakin down the hall, and probably talk Feher out of his spectrum analyzer for a day or two. Gordon's pencil made a small scratching sound against the background chugging of roughing pumps and the pervasive hum of the electronics, but he heard nothing. The ideas seemed to come up out of him and squeeze through the pencil onto the page, jotted down almost before he had thought them through, and he felt that he was on the track of something in this noise problem. There might be a new structure hiding behind the data like big game in a dense thicket. He was going to find out; he was sure of that.

CHAPTER FOUR
1998
    Gregory Markham cycled past the fragrant buildings devoted to Veterinary Medicine and swooped into the driveway of the Cavendish Laboratory. He liked the soft brush of moist air as he arced around the curves, shifting his weight in a careful rhythm. His aim was to find a minimum curve which would deposit him at the lab entrance, a geodesic for this particular local curvature of space. One last burst of pedaling and he dismounted at a respectable speed, trotting alongside, using the bike's energy to roll it into one of the concrete wheelstands.
    He straightened his brown Irish jacket and took the steps two at a time, a habit which gave him the appearance of being always late for something.
    He absently pushed his glasses back up his nose,