Major league pitchers are allowed to switch their throwing arm in the middle of an at-bat, but only if they have injured the other one

Instead of crouching, catchers stood a few feet behind home until the early 1900s

Ground rule doubles were counted as home runs until 1930

Only one major league ballplayer has been fatally injured during a game. Cleveland Indians shortstop Ray Chapman was killed when struck in the head by a pitch on August 16, 1920

To keep cool during games, Babe Ruth placed chilled cabbage leaves in the underside of his cap

During World War II, the U.S. military designed hand grenades to the shape and size of a baseball because "any young American man should be able to properly throw it"