Minicast D5: The Grandfathered Spitballers

After a player died from being hit by a pitch in 1920, Major League Baseball banned the "spitball." But it allowed 17 players whose careers were determined to be dependent on it to continue throwing it. A century later, baseball is still dealing with what it now calls the "foreign substances" issue. 

The physics and history of baseball's dirtiest pitch, plus a guy named Urban Shocker.

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