Edited by Guillermo Santos, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) Steve Chilton, some rights reserved (CC BY-NC-ND)
- 2. (c) Lauren Glevanik, some rights reserved (CC BY-NC), uploaded by Lauren Glevanik
- 3. (c) manual crank, some rights reserved (CC BY-NC-SA)
- 4. (c) Alvin Diamond, some rights reserved (CC BY-NC), uploaded by Alvin Diamond
