ABSTRACT
xii, © Robert Landau/Getty Imges; 3, © Terese Loeb Kreuzer/Alamy Images; 15, © Everett Collection/Mary Evans Picture Library; 16, © Topham/The Image Works; 20, © Michael J. Doolittle/The Image Works; 24, © Lynn Johnston/Universal Uclick; 28, © https://Katoosha/Shutterstock.com">Katoosha/Shutterstock.com; 34, © Gustoimages/Science Source; 36, © David McCarthy/Science Source; 38, © https://360b/Shutterstock.com">360b/Shutterstock.com; 48, © https://Shunsho/Shutterstock.com">Shunsho/Shutterstock.com; 53, © Tom Cheney/The New Yorker; 59, © Tom https://Sebourn/Shutterstock.com">Sebourn/Shutterstock.com; 61, © https://Mirzavisoko/Shutterstock.com">Mirzavisoko/Shutterstock.com; 70, © Christian Kober/Robert Harding World Imagery; 73, © Print Collector/HIP/ The Image Works; 74, © Edwin https://Verin/Shutterstock.com">Verin/Shutterstock.com">; 83, © Zits Partnership/King Features Syndicate; 97, ©https://Asianet-Pakistan/Shutterstock.com">Asianet-Pakistan/Shutterstock.com; 110, © The Granger Collection; 114, © The Library of Congress; 120, © Samantha Feldman/East Valley Tribune; 129, © Marco Di Lauro/AP Images; 134, © Lefteris https://Papaulakis/Shutterstock.com">Papaulakis/Shutterstock.com; 137, © Denver Post/Getty Images; 148, © Christopher Fitzgerald/The Image Works; 152, © Art Resource; 153, © https://bouzou/Shutterstock.com">bouzou/Shutterstock.com; 154, © St. Christopher’s Hospice; 178, © Peter Glass/Alamy Images; 189, © AP Photos; 193, © Chad McNeeley/U.S. Navy; 196, © Pardon My Planet/King Features Syndicate; 197, © Lebrecht Music & Arts Photo Library; 202, © age fotostock/ SuperStock; 206, © Bettmann/Getty Images; 211, © Ga https://Fulner/Shutterstock.com">Fulner/Shutterstock.com; 218, © Ned Dishman/ Getty Images; 225, © Stapleton Collection/Bridgeman Images; 229, © Frans Masereel/VG Bild-Kunst, Boon/Artists Rights Society; 234, © https://Lorraine_M/Shutterstock.com">Lorraine_M/Shutterstock.com; 246, © E. https://Lessing/lessingimages.com">Lessing/lessingimages.com; 254, © Roger Bamber/Alamy Images; 258, © Evan Vucci/AP Images; 262, © Jacques Louis David/Bridgeman Images; 264, © Andy Eames/AP Photo; 265, © RIA Novosti/The Image Works; 266, © Ben Parker/ UNICEF/AP Photos; 274, © Anton Vengo/Superstock/Fotosearch; 282, © https://Ernita/Shutterstock.com">Ernita/Shutterstock.com; 291, © Ian Hooton/Getty Images; 299, © Robert Sullivan/Getty Images; 303, © AP Photos; 320, © Fancy Collection/SuperStock; 334, © Glen Le Lievre/Cartoon Stock Inc.; 336, left, © Ronnie Kaufman/Getty Images; 336, right, © Photo Edits Inc./Bill Aron; 337, © Rich Legg/iStock; 340, © Victor https://Jones/Shutterstock.com">Jones/Shutterstock.com; 352, © Morphart https://Creation/Shutterstock.com">Creation/Shutterstock.com; 362, © Kyodo/AP Photos; 370, © https://Nicku/Shutterstock.com">Nicku/Shutterstock.com; 372, © Christophe Boisvieux/Getty Images; 377, © Zuma Press/Newscom; 387, © https://Dubova/Shutterstock.com">Dubova/Shutterstock.com; 390, © Glenda M. https://Powers/Shutterstock.com">Powers/Shutterstock.com; 397, © Bob Daemmrich/The Image Works; 406, © Lee Snider/ Photo Images/Getty Images; 414, © John Kellerman/Alamy Images; 417, © The Library of Congress; 419, © Prisma/Superstock; 424, © https://DnDavis/Shutterstock.com">DnDavis/Shutterstock.com; 426, © Hulton-Deutsch Collection/Getty Images; 432, © Dita Alangkara/AP Photos; 434, © Mark Wilson/AP Photos; 445, © https://Avella/Shutterstock.com">Avella/Shutterstock.com; 452, © Irena https://Misevic/Shutterstock.com">Misevic/Shutterstock.com; 455, © Bettmann/Getty Images; 458, © bpk/Art Resources; 460, © 2009 Museum Associates/Art Resources; 463, © Mother Goose and Grimm/King Features Syndicate; 467, © Getty Images; 471, © akg-images/Newscom; 490, © Lew Lause/Stock Connection Distribution/Alamy Images; 500, © Superstock/Getty Images; 501, © GL Archive/Alamy Images; 506, © Tom Stewart/Getty Images; 512, © Chad Baker/Jason Reed/Ryan McVay/Getty Images; 516, © Francis G. Mayer/ Getty Images; 522, © Superstock; 527, © India https://Picture/Shutterstock.com">Picture/Shutterstock.com.
