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Photo Credits
- 1. (c) Giorgio___, some rights reserved (CC BY-NC-SA)
- 2. (c) Christian Schwarz, some rights reserved (CC BY-NC), uploaded by Christian Schwarz
- 3. (c) Serge M. Appolonov, some rights reserved (CC BY-NC), uploaded by Serge M. Appolonov
- 4. (c) Marjan Kustera, some rights reserved (CC BY-NC), uploaded by Marjan Kustera
- 5. (c) Davide Puddu, some rights reserved (CC BY-NC), uploaded by Davide Puddu
- 6. (c) Marco Floriani, some rights reserved (CC BY-NC), uploaded by Marco Floriani
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- 15. (c) BiteYourBum.Com Photography, some rights reserved (CC BY-NC-ND)
- 16. (c) Recovering Algebraist, some rights reserved (CC BY-NC-ND)
- 17. (c) Giorgio Bardelli, some rights reserved (CC BY-NC), uploaded by Giorgio Bardelli
- 18. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
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- 26. (c) Amber, some rights reserved (CC BY-NC), uploaded by Amber
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- 30. (c) Matthew O'Donnell, some rights reserved (CC BY-NC-SA)
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- 56. (c) Tomás Curtis, some rights reserved (CC BY-NC), uploaded by Tomás Curtis
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- 58. (c) Dr. Alison Northup, some rights reserved (CC BY), uploaded by Dr. Alison Northup
- 59. (c) Flavio Rocchi, some rights reserved (CC BY-NC), uploaded by Flavio Rocchi
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- 61. (c) Thomas Laxton, some rights reserved (CC BY-SA), uploaded by Thomas Laxton
- 62. (c) Roman Providukhin, some rights reserved (CC BY-NC), uploaded by Roman Providukhin
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- 64. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
