ACKNOWLEDGMENTS
My tireless literary editors over the years these essays were written included
Ellen Goldensohn and Avis Lang at Natural History magazine—both of whom
ensured that, at all times, I said what I meant and meant what I said. My scientific
editor was friend and Princeton colleague Robert Lupton, who knew more than I
did, in all places where it mattered most. I also thank Betsy Lerner, for
suggestions to the manuscript that greatly improved its arc of content.