1. Computer artwork c KTSDESIGN/Science Photo Library.
2.The Triumph of Death , c.1562, Bruegel, Pieter the Elder c The Art Archive/Alamy Stock Photo.
3. c NIAID/CDC/Science Photo Library.
4. Moscow, 1968 c Sovfoto/UIG via Getty Images.
5. 14世紀法國手稿中的「死亡與死去」：Pilgrimage of the Human Life , Bodleian Library, Oxford c Art Media/Print Collector/ Getty Images.
6. c CHICUREL Arnaud/Getty Images.
7. c American Spirit/Shutterstock.com.
8. c Imagebank/Chris Brunskill/Getty Images/Bridgeman Images.
9. c H. Armstrong Roberts/ClassicStock/Getty Images.
10. c De Agostini Picture Library/G.Nimatallah/Bridgeman Images.
11.圖示：全球大型動物數量餅圖。
12. Detail from Michelangelo Buonarroti (1475–1564), the Sistine Chapel, Vatican City c LessingImages.
13. c Balint Porneczi/Bloomberg via Getty Images.
14.左圖：c Bergserg/Shutterstock.com.右圖：c s_bukley/Shutterstock. com.
15. c Karl Mondon/ZUMA Press/Corbis.
16. Adapted from Weiss, J.M., Cierpial, M.A. & West, C.H., 『Selective breeding of rats for high and low motor activity in a swim test: toward a new animal model of depression』,Pharmacology, Biochemistry and Behavior 61:49–66 (1998).
17. 同上
18. c 2004 TopFoto.
19. c NOVOSTI/AFP/Getty Images.
20. Rudy Burckhardt, photographer.Jackson Pollock and Lee Krasner papers, c.1905–1984.Archives of American Art, Smithsonian Institution.c The Pollock–Krasner Foundation ARS, NY and DACS, London, 2016.
21.左圖：c Richard Nowitz/Getty Images.右圖：c Archive Photos/ Stringer/ Getty Images.Image credits 429
22. Courtesy of the Sousa Mendes Foundation.
23. Courtesy of the Sousa Mendes Foundation.
24. c Antiqua Print Gallery/Alamy Stock Photo.
25. Woodcut from 『Passional Christi und Antichristi』by Philipp Melanchthon, published in 1521, Cranach, Lucas (1472–1553) (studio of) c Private Collection/Bridgeman Images.
26.數據來源：Emission Database for Global Atmospheric Research (EDGAR), European Commission.
27. c Bibliotheque nationale de France, RC-A-02764,Grandes Chroniques de France de Charles V, folio 12v.
28.手稿：Registrum Gregorii , c.983 c Archiv Gerstenberg/ullstein bild via Getty Images.
29. c Sadik Gulec/Shutterstock.com.
30. c CAMERIQUE/ClassicStock/Corbis.
31. c Jeff J Mitchell/Getty Images.
32. c Molly Landreth/Getty Images.
33. The Thinker, 1880–81 (bronze), Rodin, Auguste, Burrell Collection, Glasgow c Culture and Sport Glasgow (Museums)/Bridgeman Images.
34. c DeAgostini Picture Library/Scala, Florence.
35. c Bpk/Bayerische Staatsgemaldesammlungen.
36. Staatliche Kunstsammlungen, Neue Meister, Dresden, Germany c Lessing Images.
37. Tom Lea,That 2,000 Yard Stare , 1944.Oil on canvas, 36''x28''.LIFE Collection of Art WWII, U.S. Army Center of Military History, Ft.Belvoir, Virginia.cCourtesy of the Tom Lea Institute, El Paso, Texas.
38. c Bettmann/Corbis.
39. c VLADGRIN/Shutterstock.com.
40.Virgin and Child , Sassoferrato, Il (Giovanni Battista Salvi) (1609–85), Musee Bonnat, Bayonne, France c Bridgeman Images.
41. c Bettmann/Corbis.
42. c Jeremy Sutton-Hibbert/Getty Images.
43.左圖：c Fototeca Gilardi/Getty Images.右圖：c alxpin/Getty Images.
44. c Sony Pictures Television.
45. c STAN HONDA/AFP/Getty Images.
46. 『EM spectrum』.Licensed under CC BY-SA 3.0 via Commons, https://commons.wikimedia.org/wiki/File:EM_spectrum.svg#/media/File:EM_spectrum.svg .
47. c Cornell Bioacoustics Research Program at the Lab of Ornithology.
48.圖示：意識的頻譜。
49. c ITAR-TASS Photo Agency/Alamy Stock Photo.
50. c Jonathan Kirn/Getty Images.