Edited by Jeff Huston, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Jennifer de Graaf, some rights reserved (CC BY-NC)
- 2. (c) Flickr, some rights reserved (CC BY-NC)
- 3. (c) kqedquest, some rights reserved (CC BY-NC)
- 4. (c) 1999 California Academy of Sciences, some rights reserved (CC BY-NC-SA)
- 5. (c) randomtruth, some rights reserved (CC BY-NC-SA)
- 6. (c) Eric in SF, some rights reserved (CC BY-NC-ND)
- 7. (c) Matthew Herron, some rights reserved (CC BY-NC), uploaded by Matthew Herron
- 8. (c) 2011 Zoya Akulova, some rights reserved (CC BY-NC)
- 9. (c) Jerry Kirkhart, some rights reserved (CC BY)
- 10. (c) stonebird, some rights reserved (CC BY-NC-SA)
- 11. (c) James Bailey, some rights reserved (CC BY-NC), uploaded by James Bailey
- 12. (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda
- 13. (c) R.J. Adams, some rights reserved (CC BY-NC), uploaded by R.J. Adams
- 14. (c) Gravitywave, some rights reserved (CC BY-NC-SA)
- 15. (c) Joe Decruyenaere, some rights reserved (CC BY-SA)
- 16. (c) Franco Folini, some rights reserved (CC BY-SA)
- 17. (c) Tom Hilton, some rights reserved (CC BY)
- 18. (c) David Hofmann, some rights reserved (CC BY-NC-ND)
- 19. (c) Michael Chassé, some rights reserved (CC BY-NC-ND), uploaded by Michael Chassé
- 20. (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block
- 21. (c) Lynn Sweet, some rights reserved (CC BY), uploaded by Lynn Sweet