**By Wendy Murray**

Today is

**Day. Why? -- "3", "1", and "4": the first three digits of**

*Pi***, or "**

*Pi***π**," in the decimal form, which technically continues infinitely without repetition or pattern.

**is the ratio of the circumference of a circle to its diameter, which means it is an irrational number. An irrational number is a real number that cannot be expressed as a ratio "a/b," where "a" and "b" are integers and "b" is non-zero. (Other irrational numbers include Euler's number**

*Pi***, the golden ratio**

*e***φ**, and the square root of two √2.)

A real number is a value that represents a quantity along a continuous line.

An integer is a number that is written without a fractional component.

The Greek letter “

**π**” is the symbol used in mathematics to represent the constant which is approximately 3.14159. (A constant is is a "special number, usually a real number, that is 'significantly interesting in some way.'") It is possible to view

**to the 10,000th digit and also to the 1,000,000th digit and to calculate it to the 2 billionth digit here. Good luck with that.**

*Pi*According to

**Day. org,**

*Pi***’s infinite nature makes it a "fun challenge to memorize and to computationally calculate more and more digits," which is why some of us chose to major in English.**

*Pi*Coincidentally it is also Albert Einstein's birthday. He said, "If you can't explain it simply, you don't understand it well enough."

*(Below is a screen shot of a portion of “π” to the 10,000th digit. Any mathematician who tries to make sense of it is doomed to frustration.)*

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