Bicycle
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A bicycle, or bike, is a small land vehicle with two wheels. The name comes from these two wheels - the prefix "bi-" means two, and the suffix "-cycle" means wheel. It is powered by a person riding on top, who pushes the pedals around with his or her feet. Cycling or riding bicycles is an important way to travel in several parts of the world. It is also a common recreation, good exercise, and a popular sport.
Bicycling uses less energy per mile than any other human transport. In fact, it has been calculated that bicycling uses less energy per distance than any other transport in all of biology.
See Science of Cycling: Human Power: page 1.
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Bicycle
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