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The two orientations used to study knuckle-ball effects. Also shown are... | Download Scientific Diagram
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Sensors | Free Full-Text | Investigating the Knuckleball Effect in Soccer Using a Smart Ball and Training Machine
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Knuckleball allows Akron Aeros' Steven Wright to hold onto his baseball dream with his fingertips - cleveland.com
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Behind the Brazuca: NBC's extensive research hints less "knuckle-ball" in Brazil, NASA agrees - NBC Sports
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