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  ACKNOWLEDGMENTS

  After completing this book, I have more people to thank than there are miles on the River of Doubt. To no one, however, do I owe a greater debt of gratitude than to my husband, Mark Uhlig. Mark inspired me not only to work hard but to think hard, to expand my vision of this book until it far exceeded even my earliest dreams for it. Without his invaluable advice and unfailing support, this book would be much smaller in scope and spirit than it is—as would my life.

  I am also deeply indebted to James Chace, who first introduced me to the River of Doubt and encouraged me to write about it. James was a constant source of help and inspiration during his lifetime, and continues to be one even now, after his untimely death. For decades, countless writers, editors, policymakers, and students gravitated to him, drawn to his keen intellect, rare originality, and remarkable generosity. Like all great teachers, his influence will be felt for generations to come.

  As an editor at National Geographic magazine, I was always impressed by the dedication of scientists and other specialists who would spare no effort to ensure that the magazine got everything right, down to the last detail. As a writer, struggling to understand the intricacies of the Amazon rain forest, I was thrilled and grateful to find that those same experts—men and women at the top of their professions—were as willing to help an individual as they were a venerable institution like the National Geographic Society. Time and again, scientists who did not know me, and who had no personal stake in my work, generously volunteered their time to answer my endless questions, recommend the best books and journals, and introduce me to other experts in their field. They never complained when I called back for the thousandth time with “just one more question,” and they never failed to amaze me with the breadth and depth of their knowledge.