John Soteropulos’ Knuckleball. Overview of a Knuckleball. A knuckleball is a pitch thrown with little to no spin that can move unpredictably. Due to its low spin rate and what researchers call an aerodynamic phenomenon of “ unsteady lift forces ”—likely created by the seams—the ball will “dance” or “zig-zag” as it travels towards the plate. More @Wikipedia
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