The World's Sport, while simple and Americans don't like it you can't argue that it is the World's Most Popular Sport (Soccer).
This video explains how a curve of a soccer ball is created in soccer and why it is needed for a soccer player. A curve is created when a person kicks a ball and the air that flow acrossed a soccer ball as it travels is faster than than the air taveling across the center causing the pressure on the other side of the ball to increase were the air is moveing slower this unbalance of forces cause the ball to curve. This is also known as the Bernoulli's principle.
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