Mark your calendar for Monday, May 5, which marks a rare mathematical holiday. This May 5, 2025, is Square Root Day, an event that only happens nine times each century. It occurs when the day and ...

Today is Cinco de Mayo. And this year, the fifth of May is filled with mathematical joy. It is — Square Root Day! It all started in 1981. "I was writing a check in late August," says Ron Gordon, who ...