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Why do MLB players have pine tar on their helmets? - Quora
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Why do MLB players wear helmets with only one ear flap? - Quora
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Can a baseball player taking a fastball directly to the face ever be life-threatening and/or potentially life-ending? - Quora
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Why are MLB players wearing 21 on their sleeve? - Quora
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Why did Baltimore Orioles' Brooks Robinson have such a small brim on his batting helmet? - Quora
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The MLB's C-Flap helmet is saving faces on All Star at a time - ESPN
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Baseball Answers — When Did Players Start Wearing Batting Helmets?
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Why do MLB players wear helmets with only one ear flap? - Quora
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Why are MLB players wearing 21 on their sleeve? - Quora
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At the MLB level, if a pitcher unintentionally hits a batter, does he apologize? - Quora