Math lovers celebrate today (3/14) as Pi Day, in honor of the irrational number pi. Pi is an irrational number, meaning it cannot be written as a simple fraction. Here are some nerdy facts about ...

Nelson Saiers' abstract art installation on The Rock combines football jerseys, the number Pi and prison terms to protest lengthy sentences for nonviolent offenders.

What is the full pi number? It is impossible to calculate pi's exact value because it is an irrational number. Pi is the most famous irrational number.

Irrational numbers comprise numbers that cannot be represented in fraction form; that is, irrational numbers cannot be written in a fraction form. Such as the square root of 9 and the value of pi.

This means that, by choosing some errors as zero, you can limit the approximations to specific types of fractions—for example, those with denominators that are powers of 10 only.

Is π really irrational? Yes, really really. It is completely, unequivocally and blatantly not a rational number. The interesting question for me, and one I've accepted I'll never know the answer ...

Here are some nerdy facts about the irrational number, to impress your friends as you celebrate Pi Day (which is also Albert Einstein's birthday). [The 9 Most Massive Numbers in Existence] 1.