Today is Pi Day, a holiday in which we honor the mathematical constant π. Pi Day is celebrated on March 14th since 3, 1 and 4 are the three most noteworthy digits of π in the decimal form. According to Wikipedia , the United States House of Representatives supported the designation of Pi Day in 2009. How can you celebrate Pi Day here in San Francisco? Behold:

1) Inexplicably, there are some people walking the planet who prefer pie over cake. To those people we say, we respect your sinful lifestyle choice but do not wish to have it shoved down our throat. Except, that is, for a slice of notoriously tasty slice of Mission Pie at a mere $3.14. Mission Mission reports: "Today, Mission Pie is celebrating circles and everyone’s favorite irrational constant with reduced price sweet slices all day. Tap into your inner nerd, sweet tooth, and cheapskate all at once!'\

2) For a savory twist, Comstock Saloon in North Beach will offer a beef shank and bone marrow pie for Pi Day. Delightful.

3) The Exploratorium celebrates Pi Day with a livestreaming event, actual pie, and more. The celebration starts at 1:59 pm.

4) Do some math, dummy.

5) Listen to Kate Bush's "Pi" from her 2005 masterpiece Ariel. In the song (about a man infatuated with π), she sings the number to 115 decimal places. Listen below. If you're at work and cannot, Bush's whimsical lyrics are as follows:

Sweet and gentle sensitive man With an obsessive nature and deep fascination For numbers And a complete infatuation with the calculation Of PI

Oh he love, he love, he love
He does love his numbers
And they run, they run, they run him
In a great big circle
In a circle of infinity

3.1415926535 897932
3846 264 338 3279

Oh he love, he love, he love
He does love his numbers
And they run, they run, they run him
In a great big circle
In a circle of infinity
But he must, he must, he must
Put a number to it

50288419 716939937510
582319749 44 59230781
6406286208 821 4808651 32

Oh he love, he love, he love
He does love his numbers
And they run, they run, they run him
In a great big circle
In a circle of infinity

Sondheim couldn't have done it any better.

Happy Pi Day, everybody!