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FACT OF THE DAY:

Balls curve as a consequence of asymmetries in the resistance of the air through which they pass. The pitcher can throw the ball so the air pressure on one side of the ball is lower than on the opposite side. This is done by putting a spin on the ball as it leaves the pitcher's hand. The ball surface then changes the local air pressure by pushing more air molecules to one side, causing a relative air pressure difference near the ball. The ball then moves forward and also towards the direction of less air pressure, therefore curving the path of the ball. - Provided by Reference.com
 

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My brain hurts
 
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