From the penny-farthing to the pedicab, bicycles are some of humanity's most versatile vehicles. In honor of their pedal-powered practicality — not to mention their health and environmental benefits — here's a pop science guide to the wild world of cycling.
Related cycling stories on MNN:
- 10 bike-friendly cities around the globe
- For $9 in materials, a practical cardboard bike
- Politician apologizes for insulting cyclists
- Roadkill survey turns cyclists into scientists