Pi Day (3/14) often comes with sweet treats; Square Root Day (4/4/16 or 5/5/25, for example) has a certain numerical rhyme.

Pi Day (March 14) is a day of global mathematical celebration, but it’s not the only numerically significant calendar date.

American 16-year-old Cooper Lutkenhaus vowed to come back stronger after being eliminated in the 800 metre heats at the World ...