What is the science behind why a baseball is stitched the way it is?

There are 108 double stiches in an official baseball. They are carefully stiched in a pattern that goes from wide to narrow because this effects aerodynamics. When the air passes over the ball the stiches help produce a more streamlined effect which reduces the amount of drag on the ball-Drag is the reistance an object faces when it collides with air molecules, it is a type of friction which can slow down the ball.