The core material of this book came out of a long series of phone conversations the two of us had, every Saturday morning for a year and a half, in which we retraced the long adventure of New Horizons as Alan told David his memories of the project and all its precursors and phases. Out of the transcripts of these chats between us, David wrote the first drafts of most of the chapters, which we then both edited and rewrote many times, passing drafts back and forth and winnowing the narrative. The result:
