Edited by Renata Leite Pitman, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) M. Goff, some rights reserved (CC BY-NC-SA), uploaded by M. Goff
- 2. (c) Andreas Trepte, some rights reserved (CC BY-SA)
- 3. (c) Steven Mlodinow, some rights reserved (CC BY-NC), uploaded by Steven Mlodinow
- 4. (c) Gary Ashley, some rights reserved (CC BY-NC)
- 5. (c) Herman Mays, some rights reserved (CC BY-NC-SA)
- 6. (c) Roger Butterfield, some rights reserved (CC BY-NC-SA)
- 7. (c) Andrew, some rights reserved (CC BY-NC)
- 8. (c) docentjoyce, some rights reserved (CC BY)
- 9. (c) Connor, some rights reserved (CC BY-NC), uploaded by Connor
- 10. (c) Caleb Slemmons, some rights reserved (CC BY-NC)
- 11. (c) Mr. T in DC, some rights reserved (CC BY-ND)
- 12. (c) Marv Elliott, some rights reserved (CC BY-NC), uploaded by Marv Elliott
- 13. (c) Michael MK Khor, some rights reserved (CC BY)
- 14. (c) Ekaterina Chernetsova (Papchinskaya), some rights reserved (CC BY)
- 15. (c) Heather Paul, some rights reserved (CC BY-ND)
- 16. (c) Bill Carrell, some rights reserved (CC BY-NC-ND), uploaded by Bill Carrell
- 17. (c) Emőke Dénes, some rights reserved (CC BY-SA)
- 18. (c) Jamie Chavez, some rights reserved (CC BY-NC)
- 19. (c) Mike Patterson, some rights reserved (CC BY-NC), uploaded by Mike Patterson
- 20. (c) Oscar Johnson, some rights reserved (CC BY-NC-ND), uploaded by Oscar Johnson
- 21. (c) Guy Monty, some rights reserved (CC BY-NC-SA)