Heavyweight boxing champ Muhammad Ali refused to join the United States military at the height of the Vietnam War on this day in history, April 28, 1967.
On this day in history, April 14, 1910, President William Howard Taft became the first U.S.president to throw out the first pitch on baseball's Opening Day. The game was held in Washington, D.C.
Henry "Hank" Aaron broke Babe Ruth's career home run record on this day in history, April 8, 1975. Aaron hit his 715th home run, breaking Ruth's record of 714 homers.