"Of course it would," said Hassan. "Europeans didn't invent pillage."

"No, they invented the machines that made their pillaging so madly efficient. The machines that sucked all the oil out of the ground and let us carry war and famine across oceans and continents until nine-tenths of humankind was dead."

"So Columbus is responsible for the age of technology."

"Don't you see, Hassan, I'm not affixing blame?"

"I know, Tagiri."

"I'm finding the place where the smallest, simplest change would save the world from the most suffering. That would cause the fewest cultures to be lost, the fewest people to be enslaved, the fewest species to fall extinct, the fewest resources to be exhausted. it comes together at the point where Columbus returns to Europe with his tales of gold and slaves and nations to be converted into Christian subjects of the king and queen."

"So you would kill Columbus?"

Tagiri shuddered. "No," she said. "Who is to say that we could ever travel physically into the past in such a way that that would even be possible? We don't need to kill him, anyway. We only need to turn him away from his plan of sailing west. We have to find out what's possible before we decide how to do it. And murder -- I could never agree to that. Columbus was no monster. We've all agreed to that, ever since the Tempoview showed the truth of him. His vices were the vices of his time and culture, but his virtues transcended the milieu of his life. He was a great man. I have no wish to undo the life of a great man."

Hassan nodded, slowly. "Let us say this: if we knew that we could turn Columbus away, and if after much research we were sure that stopping him would really stop the terrible course of the world from that time forward, then it might be worth undoing this age of healing on the firm chance of making it unnecessary."

"Yes," said Tagiri.

"It might be the work of lifetimes, finding the answers to those questions."

"It might," said Tagiri. "But it might not."

"And even after we were very sure, we might be wrong, and the world might end up worse off than before."

"With one difference," said Tagiri. "If we stop Columbus, we can be sure of this: Putukam and Baiku would never die under Spanish swords."

"I'm with you this far, " said Hassan. "Let's find out if possible and desirable to do this thing. Let's find out if the people of our own time agree that it's worth it, that it's right to do it. And if they agree that it is, then I'll be with you when it's done."

His words were so confident -- yet she felt a dizzying vertigo, as if she stood on the edge of a great chasm, and the ground hadjust shifted a little under her feet. What sort of arrogance did she have, even to imagine reaching back into the past and making changes? Who am I, she thought, if I dare to answer prayers intended for the gods?

Yet she knew even as she doubted herself that she had already made up her mind. The Europeans had had their future, had fulfilled their most potent dreams, and it was their future that now was the dark past of her world, the consequences of their choices that now were being scoured from the Earth.

European dreams led to this, to a deeply wounded world in convalescence, with a thousand years of physicking ahead, with so much irretrievably lost, to be recovered only on the holotapes of Pastwatch. So if it is in my power to undream their dreams, to give the future to another people, who is to say that it's wrong? How could it be worse? Christopher Columbus -- Cristobal Colўn, as the Spanish called him; Cristoforo Colombo, as he was baptized in Genova -- he would not discover America after all, if she could find a way to stop him. The prayer of the village of Ankuash would be answered.

And by answering that prayer, her own thirst would be slaked. She could never satisfy the hopeless longing in the faces of all slaves in all times. She could never wipe away the sadness in the face of her ancient great-grandmother Diko and her once-joyous little boy, Acho. She could never give their lives and bodies back to the slaves. But she could do this one thing, and by doing it, the burden that had been building up inside her all these years would finally be lifted. She would know that she had done all that was possible to heal the past.

The next morninva Tagiri and Hassan reported what had happened. For weeks the most important leaders of Pastwatch and many leaders from outside Pastwatch, too, came to them to see the holotape, to discuss what it might mean. They listened to Tagiri and Hassan as they raised their questions and proposed their plans. In the end, they gave consent for a new project to explore what Putukam's vision might mean. They called it the Columbus Project, as much because it seemed the same kind of mad impossible journey that Columbus had embarked on in 1492 as because the project might lead to undoing his great achievement.

Tagiri kept the slavery project going, of course, but with Hassan she now launched the new project with a very different team of workers. Hassan led the group that studied history to see if stopping Columbus would have the effect that they desired, and to discover if some other change might be more desirable or more easily practicable. Tagiri divided her working hours between the slavery project and coordinating the work of a dozen physicists and engineers who were trying to find out exactly how it was that temporal backwash might work, and how to alter the time machines in order to enhance the effect enough to allow the alteration of the past.

Early on in their collaboration, Tagiri and Hassan married and had a daughter and a son. The daughter they named Diko, and Acho was the boy. Both children grew strong and wise, immersed in their parents' love and in the Columbus project from their infancy. Acho grew up to be a pilot, skimming over the surface of the Earth like a bird, fast and free. Diko did not stray so far from home. She learned the languages, the tools, the stories inherent in her parents' work, and spent her days beside them. Tagiri looked at her husband, her children, and more than once she thought, What if some stranger from a faraway place came and stole my son from me and made a slave of him, and I never saw him again? What if a conquering army from a place unheard of came and murdered my husband and raped my daughter? And what if, in some other place, happy people watched us as it happened, and did nothing to help us, for fear it might endanger their own happiness? What would I think of them? What kind of people would they be?

Sometimes Diko felt as if she had grown up with Christopher Columbus, that he was her uncle, her grandfather, her older brother. He was always present in her mother's work, scenes from his life playing out again and again in the background.

One of her earliest memories was of Columbus giving orders for his men to capture several Indies to take back to Spain as slaves. Diko was so young she didn't realize the significance of what was happening, really. She knew, however, that the people in the holoview weren't real, so when her mother said, with deep, bitter anger, "I will stop you," Diko thought that Mother was speaking to her and she burst into tears.

"No, no," said Mother, rocking her back and forth. "I wasn't talking to you, I was talking to the man in the holoview."

"He can't hear you," said Diko.

"He will someday."

"Papa says he died a hundred years ago."

"Longer than that, my Diko."

"Why are you so mad at him? Is he bad?"

"He lived in a bad time," said Mother. "He was a great man in a bad time."

Diko couldn't understand the moral subtleties of this. The only lesson she learned from the event was that somehow the people in the holoview were real after all, and the man called variously Cristoforo Colombo and Cristobal Colўn and Christopher Columbus was very, very important to Mother.