Edited by Gilberto Ponce Tejeda, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) barloventomagico, some rights reserved (CC BY-NC-ND)
- 2. (c) Charles Lam, some rights reserved (CC BY-SA)
- 3. (c) Dan Dzurisin, some rights reserved (CC BY-NC-ND)
- 4. (c) Rick Leche, some rights reserved (CC BY-NC-ND)
- 5. (c) Derek Scott, some rights reserved (CC BY-NC)
- 6. (c) Paul Sullivan, some rights reserved (CC BY-ND)
- 7. (c) fcornero, some rights reserved (CC BY-NC), uploaded by fcornero
- 8. (c) BJ Stacey, some rights reserved (CC BY-NC)
- 9. (c) Pablo Leautaud, some rights reserved (CC BY-NC)
- 10. (c) Mr. T in DC, some rights reserved (CC BY-ND)
- 11. (c) Jamie Chavez, some rights reserved (CC BY-NC)
- 12. (c) Bonnie Kinder, some rights reserved (CC BY-NC), uploaded by Bonnie Kinder
- 13. (c) Bengt Nyman, some rights reserved (CC BY)
- 14. (c) Rick Leche, some rights reserved (CC BY-NC)
- 15. (c) Mark Kilner, some rights reserved (CC BY-NC-SA)
- 16. (c) Robert Keereweer, some rights reserved (CC BY-NC)
- 17. (c) stirwise, some rights reserved (CC BY-NC-ND)
- 18. (c) Donald Hobern, some rights reserved (CC BY)
- 19. (c) John D Reynolds, some rights reserved (CC BY-NC), uploaded by John D Reynolds
- 20. (c) Judy Gallagher, some rights reserved (CC BY)
- 21. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 22. (c) Erin and Lance Willett, some rights reserved (CC BY-NC-ND)
- 23. (c) ian wetton, some rights reserved (CC BY-NC-ND)
- 24. (c) kens18, some rights reserved (CC BY-NC), uploaded by kens18
- 25. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 26. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow