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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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- 12. (c) Janka, some rights reserved (CC BY-NC), uploaded by Janka
- 13. (c) noah_siegel, some rights reserved (CC BY-NC-SA), uploaded by noah_siegel
- 14. (c) Harry Harms, some rights reserved (CC BY-NC-SA)
- 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
- 19. (c) telissaw, some rights reserved (CC BY-NC), uploaded by telissaw
- 20. (c) Manuela B, some rights reserved (CC BY-NC), uploaded by Manuela B
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- 26. (c) Amber, some rights reserved (CC BY-NC), uploaded by Amber
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- 28. (c) Иван Матершев, some rights reserved (CC BY-NC), uploaded by Иван Матершев
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- 30. (c) Matthew O'Donnell, some rights reserved (CC BY-NC-SA)
- 31. (c) Annelie Burghause, some rights reserved (CC BY-NC-SA)
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- 33. (c) sea-kangaroo, some rights reserved (CC BY-NC-ND), uploaded by sea-kangaroo
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- 36. (c) Dean Zagorac, some rights reserved (CC BY-NC), uploaded by Dean Zagorac
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- 39. (c) Damon Tighe, some rights reserved (CC BY-NC), uploaded by Damon Tighe
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- 43. (c) Niels, some rights reserved (CC BY-NC), uploaded by Niels
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- 47. (c) Rob Curtis, some rights reserved (CC BY-NC-SA), uploaded by Rob Curtis
- 48. (c) Liam O'Brien, some rights reserved (CC BY-NC), uploaded by Liam O'Brien
- 49. (c) Luis Ferreira, some rights reserved (CC BY-NC), uploaded by Luis Ferreira
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- 55. (c) plectrudis, some rights reserved (CC BY-NC), uploaded by plectrudis
- 56. (c) Tomás Curtis, some rights reserved (CC BY-NC), uploaded by Tomás Curtis
- 57. (c) ahmed m, some rights reserved (CC BY-NC-ND)
- 58. (c) Alison Northup, some rights reserved (CC BY), uploaded by Alison Northup
- 59. (c) Flavio Rocchi, some rights reserved (CC BY-NC), uploaded by Flavio Rocchi
- 60. no rights reserved, uploaded by Ken Kneidel
- 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
- 63. (c) emilyrsn8, some rights reserved (CC BY-NC)
- 64. (c) Jonathan (JC) Carpenter, some rights reserved (CC BY-NC), uploaded by Jonathan (JC) Carpenter
