Allie Hays’ friends had a good laugh when they heard about the class she had signed up for at North Central College in Naperville: Mathematics of Square Dancing. Hays thought it was pretty funny ...

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 ...

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