a feedback loop, leading to a panic attack. Such people were then given periodic sensitization to make sure that they felt a great deal of anxiety when they contemplated talking about the forbidden subject. Viewed one way, it was a monstrous intrusion on a person's life; but if it was compared to the common practice of imprisoning or killing people who could not be trusted with a vital secret, an order of intervention could look downright humane.
That explained, of course, why Anton was amused by everything. He had to be. If he allowed himself to become agitated or angry - any strong negative emotion, really - then he would have a panic attack even without talking about forbidden subjects. Sister Carlotta had read an article once in which the wife of a man equipped with such a device said that their life together had never been happier, because now he took everything so calmly, with good humor. "The children love him now, instead of dreading his time at home." She said that, according to the article, only hours before he threw himself from a cliff. Life was better, apparently, for everyone but him.
And now she had met a man whose very memories had been rendered inaccessible.
"What a shame," said Sister Carlotta.
"But stay. My life here is a lonely one. You're a sister of mercy, aren't you? Have mercy on a lonely old man, and walk with me."
She wanted to say no, to leave at once. At that moment, however, he leaned back in his chair and began to breathe deeply, regularly, with his eyes closed, as he hummed a little tune to himself.
A ritual of calming. So ... at the very moment of inviting her to walk with him, he had felt some kind of anxiety that triggered the device. That meant there was something important about his invitation.
"Of course I'll walk with you," she said. "Though technically my order is relatively unconcerned with mercy to individuals. We are far more pretentious than that. Our business is trying to save the world."
He chuckled. "One person at a time would be too slow, is that it?"
"We make our lives of service to the larger causes of humanity. The Savior already died for sin. We work on trying to clean up the consequences of sin on other people."
"An interesting religious quest," said Anton. "I wonder whether my old line of research would have been considered a service to humanity, or just another mess that someone like you would have to clean up."
"I wonder that myself," said Sister Carlotta.
"We will never know." They strolled out of the garden into the alley behind the house, and then to a street, and across it, and onto a path that led through an untended park.
"The trees here are very old," Sister Carlotta observed.
"How old are you, Carlotta?"
"Objectively or subjectively?"
"Stick to the Gregorian calendar, please, as most recently revised."
"That switch away from the Julian system still sticks in the Russian craw, does it?"
"It forced us for more than seven decades to commemorate an October Revolution that actually occurred in November."
"You are much too young to remember when there were Communists in Russia."
"On the contrary, I am old enough now to have all the memories of my people locked within my head. I remember things that happened long before I was born. I remember things that never happened at all. I live in memory."
"Is that a pleasant place to dwell?"
"Pleasant?" He shrugged. "I laugh at all of it because I must. Because it is so sweetly sad - all the tragedies, and yet nothing is learned."
"Because human nature never changes," she said.
"I have imagined," he said, "how God might have done better, when he made man - in his own image, I believe."
"Male and female created he them. Making his image anatomically vague, one must suppose."
He laughed and clapped her rather too forcefully on the back. "I didn't know you could laugh about such things! I am pleasantly surprised!"
"I'm glad I could bring cheer into your bleak existence."
"And then you sink the barb into the flesh." They reached an overlook that had rather less of a view of the sea than Anton's own terrace. "It is not a bleak existence, Carlotta. For I can celebrate God's great compromise in making human beings as we are."
"Compromise?"
"Our bodies could live forever, you know. We don't have to wear out. Our cells are all alive; they can maintain and repair themselves, or be