1: © Robert Harding / Robert Harding World Imagery / Corbis
2, 6, 7, 8, 12, 15, 19, 23, 24, 25, 26, 27, 28, 29, 30, 35, 36, 43, 44, 45, 50, 53, 55, 56, 57, 62, 63: Getty Images
3: © Philip de Bay / Corbis
4, 5: © The Bridgeman Art Library
9: © The Galley Collection / Corbis
10: © Alison Wright / Corbis
11: Courtesy Bostonian Society
13: © Lucien Aigner / Corbis
14: State Archives of Floria, Florida Memory, http://floridamemory.com/items/show/16075. Painted by Charles Foster of Jacksonville for the Dr. John Gorrie Ice Memorial foundation. Photographed by Frank Shannon
16: Courtesy Birdseye Estate
17, 22, 32, 47, 60, 64: © Bettmann/Corbis
18: © Philip Gendreau / Corbis
20, 21: Courtesy Carrier Corporation
31: City Noise: The Report of the Commission Appointed by Dr. Shirley W. Wynne, Commissioner of Health, to Study Noise in New York City and to Develop Means of Abating It (Academy Press, 1930)
33: Chicago History Museum, ICHi-09793, Photographer: Wallis Bros.
34: Chicago History Museum, ICHi-00698, Creator unknown
37, 38, 39: Wellcome Library, London
40: Courtesy The Clorox Company
41: Gates Foundation
42: Courtesy Texas Instruments
46: © Steven Vidler / Corbis
48: Courtesy Philip T. Priestly, from Aaron Lufkin Dennison: An Industrial Pioneer and His Legacy © 2009, NAWCC Inc. Thanks also to the NAWCC Library and Nancy Dyer.
49: Library of Congress, Prints & Photographs Division (LC-DIG-ppmsca-34721)
51: © Hans Reinhart / Corbis
52: Courtesy The Long Now Foundation. Photograph by Chris Baldwin
54: © Natural History Museum / Mary Evans Picture Library
58, 65: © Science Photo Library
59: © Corbis
61: © H. Armstrong Roberts / ClassicStock / Corbis