# Happy Pi Day!

Today is a very special day – Pi Day! Not only is March 14th Pi Day, it’s also Albert Einstein‘s birthday, and both of these important events are celebrated together.

**Did you know?**

With the use of computers, Pi has been calculated to over 1 trillion digits past the decimal. Pi is an irrational number meaning it will continue infinitely without repeating. The symbol for pi was first used in 1706 by William Jones, but was popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737.

### Pi Fun Facts

- There was a Star Trek episode, “Wolf in the Fold,” in which Spock beats the evil computer by commanding it to “compute to last digit the value of pi”.
- The symbol for pi (π) has been used in its mathematical sense only for the past 250 years or so.
- Pi is an irrational number – its digits go on forever in a seemingly random sequence.
- In the Greek alphabet, π (
*piwas*) is the sixteenth letter. In the English alphabet,*p*is also the sixteenth letter. - Chao Lu is the current world record holder in Pi calculation. He calculated pie to 67,890 digits in 24 hours and 4 minute.
- Geeks love to bake Pi pies. There are many images of those on the net.
- In 2002, a Japanese scientist found 1.24 trillion digits of pi using a powerful computer called the Hitachi SR 8000.
- One of the earliest known records of pi was written by an Egyptian scribe named Ahmes on what is now known as the Rhind Papyrus.
- The first six digits of pi (314159) appear in order at least six times among the first 10 million decimal places of pi.
- The Pi Search Page allows you to search for numerical strings in the Pi. Try looking for your birth-date!

### Pi Gifts for Pi Day!

**Pi Ice Cube Tray**

**These stylish silicone ice trays** cast frozen H2O into the symbol for your favorite irrational number. The chicks will swoon when you hand them a drink filled with Pi ice.

πππππππππππππππ

**Pi By Numbers Shirt**

Metro blue 100% cotton heavyweight t-shirt with the Pi symbol on it. The first 4493 digits of Pi were used to construct the Pi symbol itself.

πππππππππππππππ

**Pi: A Biography of the World’s Most Mysterious Number**

In this delightful layperson’s introduction to one of math’s most interesting phenomena, Drs Posamentier and Lehmann review p’s history from pre-biblical times to the 21st century, the many amusing and mind-boggling ways of estimating p over the centuries, quirky examples of obsessing about pi.

[…] בפוסט הקודם שהיום יום π (הוולגארי, לא יום π האמיתי, למרות שמתחילים להתייחס אליו […]