Edited by Alex Lamoreaux, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Minette Layne, some rights reserved (CC BY-SA)
- 2. (c) chrihag, some rights reserved (CC BY-NC), uploaded by chrihag
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- 4. (c) Gwen Baluss, some rights reserved (CC BY-NC-SA), uploaded by Gwen Baluss
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- 6. (c) Greg Hanisek, some rights reserved (CC BY-NC), uploaded by Greg Hanisek
- 7. (c) Pedro Peloso, some rights reserved (CC BY-NC), uploaded by Pedro Peloso
- 8. (c) Mila B, some rights reserved (CC BY), uploaded by Mila B
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- 10. (c) Cameron Eckert, some rights reserved (CC BY-NC), uploaded by Cameron Eckert
- 11. (c) Ken Clifton, some rights reserved (CC BY-NC)
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- 14. (c) Gordon Lau, some rights reserved (CC BY-NC), uploaded by Gordon Lau
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- 16. (c) Sergio Martínez, some rights reserved (CC BY-NC), uploaded by Sergio Martínez
- 17. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
- 18. (c) Callan Carpenter, some rights reserved (CC BY-SA)
- 19. (c) Andrew Reding, some rights reserved (CC BY-NC-ND)
- 20. (c) Mike Baird, some rights reserved (CC BY)
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- 22. (c) Vyacheslav Luzanov, some rights reserved (CC BY-NC), uploaded by Vyacheslav Luzanov
- 23. (c) Paul Steeves, some rights reserved (CC BY-NC), uploaded by Paul Steeves
- 24. (c) Jon Nelson, some rights reserved (CC BY-NC-SA)
- 25. (c) Mike Andersen, some rights reserved (CC BY-NC-ND), uploaded by Mike Andersen
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- 27. (c) Don McCullough, some rights reserved (CC BY-NC)
- 28. (c) Terry Carr, some rights reserved (CC BY-NC), uploaded by Terry Carr
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- 31. (c) Sara Thiebaud, some rights reserved (CC BY-NC), uploaded by Sara Thiebaud
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- 33. (c) Mike Patterson, some rights reserved (CC BY-NC), uploaded by Mike Patterson
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- 43. (c) Thomas Barbin, some rights reserved (CC BY-NC), uploaded by Thomas Barbin
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- 46. (c) Larry Clarfeld, some rights reserved (CC BY-NC), uploaded by Larry Clarfeld
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- 48. (c) Guy Lemelin, some rights reserved (CC BY-NC), uploaded by Guy Lemelin
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- 51. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 52. (c) Zach Hawn, some rights reserved (CC BY-NC-SA)
- 53. (c) Aleksandr Popov / Александр Попов, some rights reserved (CC BY-NC), uploaded by Aleksandr Popov / Александр Попов
- 54. (c) Kai-Philipp Schablewski, some rights reserved (CC BY-NC), uploaded by Kai-Philipp Schablewski
- 55. (c) Andrew Bazdyrev, some rights reserved (CC BY), uploaded by Andrew Bazdyrev
- 56. (c) Nicholas Sly, some rights reserved (CC BY-NC), uploaded by Nicholas Sly
- 57. (c) Jason Headley, some rights reserved (CC BY-NC), uploaded by Jason Headley
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- 60. (c) Anne Parsons, some rights reserved (CC BY-NC), uploaded by Anne Parsons
- 61. (c) eugenezakharov, some rights reserved (CC BY-NC), uploaded by eugenezakharov
- 62. (c) Don Loarie, some rights reserved (CC BY), uploaded by Don Loarie
- 63. (c) Franco Folini, some rights reserved (CC BY), uploaded by Franco Folini
- 64. (c) Maxwell Mantell, some rights reserved (CC BY-NC), uploaded by Maxwell Mantell
- 65. (c) Alex Abair, some rights reserved (CC BY-NC), uploaded by Alex Abair
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- 67. (c) Doug Murphy, some rights reserved (CC BY-SA)
- 68. (c) Mathieu Massaviol, some rights reserved (CC BY-NC-ND), uploaded by Mathieu Massaviol
- 69. (c) Peter Stevens, some rights reserved (CC BY)
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- 71. (c) edgeplot, some rights reserved (CC BY-NC-SA)
- 72. (c) Calli, some rights reserved (CC BY-NC), uploaded by Calli
- 73. (c) Joshua Tewksbury, some rights reserved (CC BY-NC-SA), uploaded by Joshua Tewksbury
- 74. (c) cayleycrist, some rights reserved (CC BY-NC), uploaded by cayleycrist
- 75. (c) Michael Kauffmann, some rights reserved (CC BY-ND), uploaded by Michael Kauffmann
- 76. (c) Dmitry Ivanov, some rights reserved (CC BY-NC), uploaded by Dmitry Ivanov
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- 82. (c) Emma Harrower, some rights reserved (CC BY-NC)
- 83. (c) James Gaither, some rights reserved (CC BY-NC-ND)
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- 85. (c) Degtyarev Nikolai Ivanovich, some rights reserved (CC BY-NC), uploaded by Degtyarev Nikolai Ivanovich
- 86. (c) J. Maughn, some rights reserved (CC BY-NC), uploaded by J. Maughn
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