On 9/16/25, celebrate a date of mathematical beauty

sciart0
Sep 16
1 min read

Once 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.

Recent Posts

See All

The First Prophet of Abundance

David Lilienthal’s account of his years running the Tennessee Valley Authority can read like the Abundance of 1944. We still have a lot to learn from what the book says — and from what it leaves out.

WHY IS ROBERT F. KENNEDY JR. SO CONVINCED HE’S RIGHT?

How an outsider, once ignored by the public-health establishment, became the most powerful man in science

What the S&P 500 is hiding about the economy

A few trillion-dollar companies are powering the market’s gains. Here’s what’s happening to most other businesses in the United States. Thanks Tom!