to "Ride lightly in our Garden of Eden"
Many improvements have been made to the bicycle, with new materials used for increased strength and lighter weight, and aerodynamic designs that hint of sc-fi.
A key element of the bicycle is the bicycle chain. This mass produced, taken for granted part of the bicycle makes the bicycle as efficient as it is. Close to 100% of the power is transferred from the rider to the rear wheel, via the chain. No other method matches this quality.