Edited by David Lozano Vázquez, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Kentish Plumber, some rights reserved (CC BY-NC-ND)
- 2. (c) Allan Hopkins, some rights reserved (CC BY-NC-ND)
- 3. (c) Patrick Coin, some rights reserved (CC BY-NC-SA)
- 4. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 5. (c) Jerry Oldenettel, some rights reserved (CC BY-NC-SA)
- 6. (c) Michael Gochfeld, some rights reserved (CC BY-NC), uploaded by Michael Gochfeld
- 7. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 8. (c) Lip Kee, some rights reserved (CC BY-SA)
- 9. (c) Heather Paul, some rights reserved (CC BY-ND)
- 10. (c) tnewman, some rights reserved (CC BY-NC)
- 11. (c) Rafy Rodriguez, some rights reserved (CC BY-NC-SA)
- 12. (c) Donna Pomeroy, some rights reserved (CC BY-NC), uploaded by Donna Pomeroy
