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"They're building a spaceship," said Wallingford in a flat voice. It was Wallingford's way of saying he wasn't going to answer any questions, but Mike the Angel ignored the hint. "I'd sort of gathered that," he said dryly. "But what I want to know is: Why is it being built around a cryotronic brain, the like of which I have never heard before?"

And that, Mike happened to know, was the density of a cryotronic brain, which is 90 per cent liquid helium and 10 per cent tantalum and niobium, by volume. He looked at the microcryotron stack in his hand. It was a one-hundred-kilounit stack. The possible connections within it were factorial one hundred thousand.

Mike's muttering; the clipped, staccato conversation of the power crew; the noises of the tools; the deep throb of the ship itself; the underlying oddness of the engine vibrations all these were fed into his microphonic ears. The scene itself was transmitted to his brain and recorded. The cryotronic maze in the depths of the ship chewed the whole thing over. Snookums acted.

As far as the exterior observers were concerned, it seemed to lift into the air with a loud, thrumming noise, like a huge elevator rising in an invisible shaft. It had been built in a deep pit in the polar ice, built around the huge cryotronic stack that was Snookums' brain. As it rose, electric motors slid back the roof that covered the pit, and the howling Antarctic winds roared around it.