He had had many conversations during his long life. Some were fascinating and stayed with him more than a century later. Others were less so. As a younger man he had tolerated those as part of the cost of doing business—a sort of tax that all people must pay in order to take part in civilized society. When he had turned one hundred, he had decided to stop paying that tax. Henceforth he would engage only in conversations that really interested him—which, with a few exceptions for close friends and family members, meant conversations with a purpose. Remembrance carried in her head a list of all the people whom Doc might actually care to have a conversation with, and knew how to turn the others aside, typically by playing the age card. The list changed slowly over time, and certain people, some of whom were quite important, were occasionally discomfited to find that they were no longer on it. The list had been written down only once, twenty years ago, when Doc and Remembrance had established their relationship. She had committed it to memory and destroyed it. It now existed only in her—not Doc’s—head. Perhaps 10 percent of the original names remained. Many of them had died. The others had been crossed off, almost always without any volition from Doc. Remembrance stayed off to one side during his conversations, on the pretext that she might be needed to intervene medically. But what she was really doing was following the dialogue and monitoring Doc for signs, not that his heart was failing or his medication wearing off, but that he was bored. Sometimes, during their first decade together, he had gone so far as to glance in her direction and catch her eye for a moment while his interlocutor wasn’t looking, and this had been enough to eliminate that person from the list, but since then it had no longer been necessary. In many cases Remembrance had made what Doc had, at the time, considered to be mistakes in her performance of this duty, but on further consideration he had seen what she had seen quicker, and come to agree with her.