The practice of identifying baseball players by number was started by the Yankees in 1929.
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The first baseball caps were made of straw.
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During WWII, because a lot of players were called to duty, the Pittsburgh Steelers and Philadelphia Eagles combined to become The Steagles.
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In England, there's a phenomenon called the "half-time kettle effect" where power use surges at half-time during England's matches in the World Cup as everyone turns on their tea kettles at the same time.
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Prior to 1900, prize fights lasted up to 100 rounds.
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A 'face-off' in hockey was originally called a 'puck-off'.
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In 1910 football teams were penalized 15 yards for an incompleted forward pass.
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