Pastwatch- The Redemption Of Christopher Columbus - By Orson Scott Card Page 0,87

thinking how to drag out the examination of Colyn, waiting for the desires of the monarchs to resolve themselves, Talavera sat in his austere chamber trying to think how to force the issue. One thing he certainly could not do was suddenly, after all these years and with no significant new arguments, announce that the committee was deciding in favor of Colyn. Maldonado and his supporters would protest directly to the King's men, and a power struggle would ensue. The Queen would almost certainly lose such an open struggle, since her support from the lords of her realm depended in large part on the fact that she was known to "think like a man." Disagreeing openly with the King would give the lie to that idea. Thus open support for Colyn would lead to division and probably would not lead to a voyage.

No, Talavera thought, the one thing I cannot do is support Colyn. So what can I do?

I can set him free. I can end the process and let him go on to another king, to another court. Talavera well knew that Colyn's friends had made discreet inquiries in the courts of France and England. Now that the Portuguese had achieved their quest for an African route to the East, they might be able to afford a small exploratory expedition toward the west. Certainly the Portuguese advantage in trading with the Orient will be envied by other kings. Colyn might well succeed somewhere. So whatever else happens, I must end his examination immediately.

But could there not also be a way to end the examination and yet turn things to the advantage of Colyn's supporters?

With a half-formed plan in mind, Talavera sent to the Queen a note bearing his request for a secret audience with her on the matter of Colyn.
* * *

Tagiri did not understand her own reaction to the news of success from the scientists working on time travel. She should be happy. She should be rejoicing to know that her great work could, physically, be accomplished. Yet ever since the meeting with the team of physicists, mathematicians, and engineers working on the time travel project, she had been upset, angry, frightened. The opposite of how she had expected she would feel.

Yes, they said, we can send a living person into the past. But if we do so there is no chance, no chance whatsoever, that our present world will survive in any form. To send someone into the past to change it is the end of ourselves.

They were so patient, trying to explain temporal physics to historians. "If our time is destroyed," Hassan asked, "then won't that also destroy the very people that we send back? If none of us are ever born, then the people we send won't have been born either, and therefore they could never have been sent. "

No, explained the physicists, you're confusing causality with time. Time itself, as a phenomenon, is utterly linear and unidirectional. Each moment happens only once, and passes into the next moment. Our memories grasp this one-way flow of time, and in our minds we link it with causality. We know that if A causes B, then A must come before B. But there is nothing in the physics of time that requires this. Think of what your predecessors did. The machine they sent back in time was the product of a long causal network. Those causes were all real, and the machine actually existed. Sending it back in time did not undo any of the events that led to the creation of that machine. But in the moment that the machine caused Columbus to see his vision on that beach in Portugal, it began to transform the causal network so that it no longer led to the same place. All of those causes and effects really happened -- the ones leading to the creation of the machine, and the ones following from the machine's introduction into the fifteenth century.

"But then you're saying that their future still exists," Hunahpu protested.

That depends on how you define existence, they explained. As a part of the causal network leading to the present moment, yes, they continue to exist in the sense that any part of their causal network that led to the existence of their machine in our time is still having effects in the present world. But anything peripheral or irrelevant to that is now utterly without effect in our timestream. And anything in their history that the introduction of