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A softball is less dense than a baseball thus, is more susceptible to aerodynamic forces. From a doctoring viewpoint, the object is not to add a great mass of goop to the ball, but to alter the boundary layer of air flowing over the ball, in particular by changing the smoothness over a region. A gross example of this can be seen in the curveball trainers found in sporting goods stores. Much less dense than a baseball (same size though) and it has a series of grooves over half the surface.
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