Addenda:

Reader Amy wins the Geek Prize for taking a photo of the right time on Pi Day—to the second.  You won’t see this for another 100 years:

And Melissa Chen posted this highly creative Pi Day Act on Facebook:

Finally, a tw**t from Neil deGrasse Tyson:

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Pi Day means that today’s date (in American usage) is 3/14/15, which is pi to five digits. This won’t happen again for a century. Sadly, I missed by about 30 minutes putting up this post at a time with three more digits that are accurate:

3/14/15 9:26

I’m a bad person.

To make up for that, here’s a teenager reciting the first 100 digits of pi, balancing a book on her head, and solving a Rubik’s cube. This is what we call a “polymath”:

and here’s a 10-year-old reciting 370 digits of pi.

Be sure to mark the day this way (Make mine the Hoosier…