Edited by Breanna Ondich and gstcresearch, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) manual crank, some rights reserved (CC BY-NC-SA)
- 2. (c) Nate Martineau, some rights reserved (CC BY-NC), uploaded by Nate Martineau
- 3. (c) Joshua Mayer, some rights reserved (CC BY-SA)
- 4. (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick