Crediti fotografici

AlaskaStock/Corbis; American Association for the Advancement of Science; AMNH, American Museum of Natural History, New York; Yann Arthus-Bertrand/Corbis; Pallava Bagla/ Corbis; Tiziana and Gianni Baldizzone/Corbis; Anthony Bannister/ Gallo Images/Corbis; Biblioteca Nazionale “Vittorio Emanuele III” Napoli; Ben Gunn; BPI/Steve Bardens/BPI/ Corbis; Sophie Bassouls/Sygma/Corbis; Morton Beebe/Corbis; Davide Bonadonna; Oliver-Bonjoch; Brooklyn Museum/ Corbis; Jason Brown; R. Cann/M. Stoneking/A. Wilson; Stephane Cardinale/Sygma/Corbis; John Carnemolla/Corbis; Luigi Luca Cavalli Sforza; Jaime Chirinos/Science Photo Library; Chris Collins/Corbis; Corbis; William Coupon/Corbis; Mauro Cutrona; Giovanni Dall’Orto; Roger De La Harpe; Gallo Images/ Corbis; Giacomo Devoto; Sam Diephuis/Corbis; James DiLoreto and Donald Hurlbert, Smithsonian Institution; Bruno Ehrs/Corbis; epa/Corbis; Natalie Fobes/ Corbis; James Gathany/CDC; Nuka Godfredtsen; Kristy-Anne Glubish/ Design Pics/Corbis; Stefano Grande; Nicolas Guerin/Corbis; Michael Hall Photography Pty Ltd/Corbis; Jeremy Horner/ Corbis; Rob Howard/ Corbis; George H.H. Huey/Corbis; Peter Johnson/Corbis; Guy Jonsson; Wolfgang Kaehler/Corbis; Karen Kasmauski/Corbis; Kenneth Kidd; Tomislav Kranjcic; Johannes Krause; Bob Krist/Corbis; Frans Lanting/Corbis; Charles & Josette Lenars/Corbis; Philip Lieberman; Craig Lovell/Corbis; Lawrence Manning/Corbis; Jay Matternes; John McAnulty/Corbis; Max Milligan/JAI/Corbis; Ministero per i Beni e le Attività Culturali; Momatiuk – Eastcott/Corbis; Adolf Naef; NASA; National Academy of Sciences, USA; National Geographic Society; Marie-Lan Nguyen; Paul Nicklen/National Geographic Society/Corbis; Kazuyoshi Nomachi/Corbis; Ria Novosti/Science Photo Library; Erwin Patzelt/dpa/ Corbis; Nigel Pavitt/JAI/Corbis; Pearson Education; Douglas Peebles/Corbis; Raffaele Petralla; Angelo Porcheddu; Radius Images/Corbis; Carlo Ranzi; Rosino; Anders Ryman/Corbis; SAGE Publications; S.A.I.A. (Scuola Archeologica Italiana Atene); Science Picture Co/Science Faction/Corbis; Scientific American; David Scharf/Science Photo Library; Gregor M. Schmid/Corbis; Sedicinoni; Paul A. Souders/Corbis; Tomas Strasser; Ian Tattersall/Diana Salles; Sheila Terry/Science Photo Library; The National Academy of Sciences; The Natural History Museum, London; The Print Collector/Corbis; Amy Toensing; Gustavo Tomsich/Corbis; TRENDS in Genetics; Frank Vinken; Stuart Westmorland/Corbis; Tim White/David Brill; Nevada Wier/Corbis; Ken Wilson; Papilio/Corbis; Janet Wishnetsky/Corbis; xstefanou/Demotix/Demotix/Corbis.