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Submitted by Alex Torres on

Bicycles have been a form of exercise, and part of sports, and a means of transportation for a very long time. Many people in developing countries rely heavily on the bicycle for transportation. Even in cities across the U.S. you will see people traveling to and from work or school on a bicycle. Now with "global warming" becoming an important topic, bicycles are get more and more attention because of their minimal impact on the environment.