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Photo Credits
- 1. (c) naitokz, some rights reserved (CC BY-ND)
- 2. (c) Paul Meidinger, some rights reserved (CC BY-NC-SA)
- 3. (c) Eric in SF, some rights reserved (CC BY-NC-ND)
- 4. (c) Dawn Endico, some rights reserved (CC BY-SA)
- 5. (c) randomtruth, some rights reserved (CC BY-NC-SA)
- 6. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 7. (c) Brent Miller, some rights reserved (CC BY-NC-ND)
- 8. (c) 2008 Keir Morse, some rights reserved (CC BY-NC-SA)
- 9. (c) rickr, some rights reserved (CC BY), uploaded by rickr
- 10. (c) Dan and Raymond, some rights reserved (CC BY-NC-SA)
- 11. (c) hobiecat, some rights reserved (CC BY-NC), uploaded by hobiecat
- 12. (c) --Tico--, some rights reserved (CC BY-NC-ND)
- 13. (c) F. D. Richards, some rights reserved (CC BY-SA)
- 14. (c) josh jackson, some rights reserved (CC BY)
- 15. (c) Steve Guttman, some rights reserved (CC BY-NC-ND)
- 16. (c) Ken-ichi Ueda, some rights reserved (CC BY)
- 17. (c) Joel E, some rights reserved (CC BY-ND), uploaded by Joel E
- 18. (c) Robert, some rights reserved (CC BY-NC)
- 19. (c) Martin LaBar, some rights reserved (CC BY-NC)
- 20. (c) anonymous, some rights reserved (CC BY-NC)
- 21. (c) Matt Lavin, some rights reserved (CC BY-SA)
- 22. (c) Patrick Alexander, some rights reserved (CC BY-NC-ND)
- 23. (c) Henry Burrows, some rights reserved (CC BY-SA)
- 24. (c) joysaphine, some rights reserved (CC BY-NC)
- 25. (c) gravitywave, some rights reserved (CC BY-NC-SA)
- 26. (c) James Gaither, some rights reserved (CC BY-NC-ND)
- 27. (c) M.E. Sanseverino, some rights reserved (CC BY-NC-ND)
- 28. (c) Walter Siegmund, some rights reserved (CC BY-SA)
- 29. (c) stonebird, some rights reserved (CC BY-SA)
- 30. (c) Michael Schmidt, some rights reserved (CC BY-NC-SA)
- 31. (c) stonebird, some rights reserved (CC BY-NC-SA)
- 32. (c) Valter Jacinto, some rights reserved (CC BY-NC-SA)
- 33. (c) Anthony Mendoza, some rights reserved (CC BY-NC-SA)
- 34. (c) Antonio Ilardo, some rights reserved (CC BY-NC-SA)
- 35. (c) Verdurbano, some rights reserved (CC BY-NC-ND)
- 36. (c) rbrostrom, some rights reserved (CC BY-NC)
- 37. (c) Biopix, some rights reserved (CC BY-NC)
- 38. (c) kqedquest, some rights reserved (CC BY-NC)
- 39. (c) Maggie, some rights reserved (CC BY-NC)
- 40. (c) Franco Folini, some rights reserved (CC BY)
- 41. (c) 2012 Barry Breckling, some rights reserved (CC BY-NC-SA)
- 42. (c) c michael hogan, some rights reserved (CC BY-NC-SA), uploaded by c michael hogan
- 43. (c) 2009 Gary A. Monroe, some rights reserved (CC BY-NC)
- 44. (c) Bill Bumgarner, some rights reserved (CC BY-NC-ND)
- 45. (c) dloarie, some rights reserved (CC BY), uploaded by dloarie
- 46. (c) wanderflechten, some rights reserved (CC BY-NC-ND)
- 47. (c) Ken-ichi Ueda, some rights reserved (CC BY-NC-SA)
- 48. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 49. (c) Tom Hilton, some rights reserved (CC BY), uploaded by Tom Hilton
- 50. (c) Tony Rodd, some rights reserved (CC BY-NC-SA)
- 51. (c) beautifulcataya, some rights reserved (CC BY-NC-ND)
- 52. (c) Bryant Olsen, some rights reserved (CC BY-NC)
- 53. (c) Philip Bouchard, some rights reserved (CC BY-NC-ND)
- 54. (c) devra, some rights reserved (CC BY)
- 55. (c) Radio Tonreg, some rights reserved (CC BY)
- 56. (c) Bill Rogers, some rights reserved (CC BY-NC-ND)
- 57. (c) Per Verdonk, some rights reserved (CC BY-NC)
- 58. (c) 2006 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 59. (c) Franco Folini, some rights reserved (CC BY-SA)