Continuity continuity, the way knowledge passes from one person to the next and from one time to the next, is what this whole volume is about. You can think of it like a chain. Each link is something we know. If the chain holds, we can add new links. If it breaks, we have to find the ends and join them again. How does the chain hold? First, people have to remember. Then they have to tell others, or write it down, or show it with their hands. Then those others have to trust what they heard and try it for themselves. When they do, the knowledge is no longer only in one head. It lives in the group. That is continuity. You can see it in small things. A recipe passed from a grandparent to a child. A song that everyone knows the words to. A way of tying a knot that someone teaches you by doing it slowly while you watch. None of these need a school or a book. They need attention, repetition, and someone who cares enough to pass them on. Continuity can break. Wars, disasters, or forgetting can scatter the links. When that happens, people must ask: What did we used to know? How did we know it? How could we learn it again? The answers are not always in a library. Sometimes they are in the way a craftsperson holds a tool, or in the rhythm of a story told at the right time. So continuity is not only about saving words. It is about saving the way we do things and the way we check for error. This volume asks three questions again and again. How was this known? How could it be wrong? How could it be found again? When you can answer those, you are already helping the chain hold. What would you pass on first, if you had to choose?