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By Root 2215 0

lab on the second story of the northeasternmost building in his high school, where hours had passed like minutes, the flat little wavetank full of marvels. Here the groundswell originated in the North Sea’s perpetual eastward motion around the globe; the swell was greater or smaller depending on whether local winds reinforced it or interfered with it. The light gravity made for big broad waves, quickly generated by strong winds; if today’s wind got very much stronger, for instance, then the wind-chop from the west would quickly grow bigger than the groundswell from the north, and obscure it completely. Waves on the North Sea were notorious for their size and mutability, their recombinant surprises, though it was also true that they moved fairly slowly through the water; big slow hills, like the giant dunes of Vastitas far underneath them, migrating around the planet. Sometimes they could get very big indeed; in the aftermath of the typhoons that blew over the North Sea, waves seventy meters high had been reported.

This lively cross chop seemed enough for Ann, who was looking a bit distressed. Sax could not think what to say to her. He doubted that his thoughts on wave mechanics would be appropriate, though it was very interesting of course, and would be to anyone interested in the physical sciences. As Ann was. But perhaps not now. Now the sheer sensory array of water, wind, sky— it looked like it was enough for her. Perhaps silence was in order.

Whitecaps began to roll down the faces of some of the cross-chop waves, and Sax immediately checked into the ship’s weather system to see what the wind speed was. The ship had it at thirty-two kilometers per hour. So this was about the speed at which the crests of waves were first knocked over. A simple matter of surface tension against wind speed, calculable, in fact . . . yes, the appropriate equation in fluid dynamics suggested they should start to collapse at a wind speed of thirty-five kilometers per hour, and here they were: whitecaps, startlingly white against the water, which was a dark blue, Prussian blue Sax thought it might be. The sky today was almost sky blue, slightly em-purpled at the zenith, and somewhat whitened around the sun, with a metallic sheen between sun and the horizon under it.

“What are you doing?” Ann said, sounding annoyed.

Sax explained, and she listened in stony silence. He didn’t know what she might be thinking. That the world was somewhat explicable— he always found that a comfort. But Ann . . . well, it could be as simple as seasickness. Or something from her past, distracting her; Sax had found in the weeks since the experiment at Underhill that he was often distracted by some past incident, rising unbidden from a great bulk of them in his mind. Involuntary memory. And for Ann, that might include negative incidents of one kind or another; Michel had said she had been mistreated as a child. It still seemed to Sax too shocking to believe. On Earth men had abused women; on Mars, never. Was that true? Sax did not know for sure, but he felt it was true. This was what it meant to live in a just and rational society, this was one of the main reasons it was a good thing, a value. Possibly Ann would know more about the reality of the situation these days. But he did not feel comfortable asking her. It was clearly contraindicated.

“You’re awfully quiet,” she said.

“Enjoying the view,” he said quickly. Perhaps he had better talk about wave mechanics after all. He explained the groundswell, the cross chop, the negative and positive interference patterns that could result. But then he said, “Did you remember much about Earth, during the Underhill experiment?”

“No.”

“Ah.”

This was probably some kind of repression, and exactly the opposite of the psychotherapeutic method that Michel would probably have recommended. But they were not steam engines. And some things were no doubt better forgotten. He would have to work on once again forgetting John’s death, for instance; also on remembering better those parts of his life when he had been most social, as