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Now, you know and so do I that part of what they found out they wouldn't accept. Time-travel is impossible. So when you children told them where you come from they wouldn't believe it. They'd try to pry back behind what they'd consider a lie. They'd use different techniques of inquiry. They'd use inhibition-releasing drugs. They'd ..." Fran's expression did not change. Yet it was not passive.
When I have thoroughly learnt how to Time-travel I will go back much further perhaps to the French Revolution, and watch people being guillotined." She scribbled diligently in the thick exercise-book, which Aunt Mary produced without once asking what it was wanted for. "It just shows " Mollie murmured gratefully; "some people would have teased me to death."
If time-travel were possible, a man travelling about in the past might by some accident kill his grandfather, or his father, in which case he could not be born, and hence could not possibly go back in time. But if he did not go back in time he would be born and could face the possibility of preventing his own existence if time-travel was possible.
Transposition's the best word. The effect was time-travel but the process wasn't, like a telephone has the effect of talking at a distance but the method is distinctly something else." Fran jerked his fishing-rod. A nine-inch lake-trout flapped in the boat's bottom. "I'm supposed to be teaching you how to fish!" said Soames.
"You wouldn't dare do anything to change the past. That was always one of the favorite paradoxes in time-travel fiction.... Well, I think I have the general picture. You have a dictator who is tyrannizing you; you want to get rid of him; you can't kill him yourselves. I'm opposed to dictators, myself; that and the Selective Service law, of course was why I was a soldier.
He told them, giving them the tape from the wave-guide radar and speaking with strict precision of every event up to the moment of his arrival at Gissell Bay with the children and their artifacts. He did not mention telepathy or time-travel because they seemed so impossible.
Up to this moment Soames had doggedly accepted the idea that the children came out of a past so remote that numbers of years simply had no meaning. The evidence was overwhelming even though the law of the conservation of mass and energy denied the possibility of time-travel. Now, abruptly, Soames saw the infinitely simple answer. Time-travel was possible, provided certain conditions were met.
Murdock, trapped by the Reds in one of those wrecked ships, had inadvertently summoned its original owners, who had descended to trace through the Russian time stations the looters of their wrecks, destroying the whole Red time-travel system. But the aliens had not chanced on the parallel western system. And a year later that had been put into Project Folsom One.
But this was impossible, so time-travel was impossible. On a higher technical level, there is just one law of nature which seems infallibly true, since its latest modification to allow for nuclear energy. It is the law of the conservation of mass and energy. The total of energy and matter taken together in the universe as a whole, cannot change.
"You can rely on his dates and happenings; his interpretation's strictly capitalist, of course," he said. Black-jacket shook his head. "You first, Gregory," he said. "Tell him how he got here, and then I'll tell him why." "I believe," Gregory began, "that in your period, fiction writers made some use of the subject of time-travel.
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