On 9/16/25, celebrate a date of mathematical beautysciart0Sep 16, 20251 min readOnce a century, a very special day comes along. That day is today — 9/16/25.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. But the particular string of numbers in today's date may be especially delightful to the brains of mathematicians and the casual nerds among us.
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