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By Root 341 0

insulate dwelling walls), Elda the English teacher (now practical nurse, frostbite cases a speciality). There were others, but those three were always there when they could get away. They were Harry Malibert fans who had read his books and dreamed with him of radio messages from weird aliens from Aldebaran, or worldships that could carry million-person populations across the galaxy, on voyages of a hundred thousand years. Timmy listened, and drew sketches of the worldships. Malibert supplied him with dimensions. "I talked to Gerry Webb," he said, "and he'd worked it out in detail. It is a matter of rotation rates and strength of materials. To provide the proper simulated gravity for the people in the ships, the shape has to be a cylinder and it has to spin - sixteen kilometers is what the diameter must be. Then the cylinder must be long enough to provide space, but not so long that the dynamics of spin cause it to wobble or bend -perhaps sixty kilometers long. One part to live in. One part to store fuel. And at the end, a reaction chamber where hydrogen fusion thrusts the ship across the Galaxy."

"Hydrogen bombs," said the boy. "Harry? Why don't the bombs week the worldship?"

"It's engineering," said Malibert honestly, "and I don't know the details. Gerry was going to give his paper at the Portsmouth meeting; it was one reason I was going." But, of course, there would never be a British Interplanetary Society meeting in Portsmouth now, ever again.

Elda said uneasily, "It is time for lunch soon. Timmy? Will you eat some soup if I make it?" And did make it, whether the boy promised or not. Elda's husband had worked at Keflavik in the PX, an accountant; unfortunately he had been putting in overtime there when the follow-up missile did what the miss had failed to do, and so Elda had no husband left, not enough even to bury.

Even with the earth's hot water pumped full velocity through the straining pipes it was not warm in the gasthuis. She wrapped the boy in blankets and sat near him while he dutifully spooned up the soup. Lars and Ingar sat holding hands and watching the boy eat. "To hear a voice from another star," Lars said suddenly, "that would have been fine."

"There are no voices," said Ingar bitterly. "Not even ours now. We have the answer to the Fermi paradox."

And when the boy paused in his eating to ask what that was, Harry Malibert explained it as carefully as he could:

"It is named after Enrico Fermi, a scientist. He said, 'We know that there are many billions of stars like our sun. Our sun has planets, therefore it is reasonable to assume that some of the other stars do also. One of our planets has living things on it. Us, for instance, as well as trees and germs and horses. Since there are so many stars, it seems almost certain that some of them, at least, have also living things. People. People as smart as we are - or smarter. People who can build spaceships, or send radio messages to other stars, as we can.' Do you understand so far, Timmy?" The boy nodded, frowning, but - Malibert was delighted to see -kept on eating his soup. "Then, the question Fermi asked was, 'Why haven't some of them come to see us?'"

"Like in the movies," the boy nodded. "The flying saucers."

"All those movies are made-up stories, Timmy. Like Jack and the Beanstalk, or Oz. Perhaps some creatures from space have come to see us sometime, but there is no good evidence that this is so. I feel sure there would be evidence if it had happened.

There would have to be. If there were many such visits, ever, then at least one would have dropped the Martian equivalent of a McDonald's Big Mac box, or a used Sirian flash cube, and it would have been found and shown to be from somewhere other than the Earth. None ever has. So there are only three possible answers to Dr Fermi's question. One, there is no other life. Two, there is, but they want to leave us alone. They don't want to contact us, perhaps because we frighten them with our violence, or for some reason we can't even guess at. And the third reason—" Elda made a quick gesture, but Malibert