Tom Zonfrillo's geometry class at Heidelberg High School celebrates Pi Day March 14 in honor of 3.14, the ratio of a circle or cylindrical object's circumfrence divided by its diameter. (photo by Kelli Bland, Herald Post)

At the Exploratorium we hosted the 24th Annual Pi Day on March 14th, 2012. Founded at the Exploratorium by our own Prince of Pi, physicist Larry Shaw, Pi Day has become an international holiday, celebrated live and online all around the world. This was our last Pi Day celebration at the Palace of Fine Arts before we move to Pier 15 along San Francisco's Embarcadero in 2013.

Above: Lori Lambertson teaches the Pi Day crowd how to measure Pi with string.

Photo by Gayle Laird

© Exploratorium, www.exploratorium.edu

The 'pi' power poles on the Fermilab campus. A bit late for national pi day but almost!

The brothers of Sigma Pi celebrated 50 Years since the founding (1969) of Sigma Pi’s Delta Epsilon chapter at Seton Hall.

Bild kann von Kirchgemeinden frei genutzt werden.

For Pi day at my son's school

Thingiverse: www.thingiverse.com/thing:567199

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Join the Bounce Club dudes, as Pi & Professor E=mc2, track the missing Bounce for Gravity Rabbit... as the Tour de Force vids open a cosmic horizon to Pi & Gravity on the Quest for the Bounce...

Rekn Pi

Photographs from the Education Track & Raspberry Jam

when I was putting Pi back together the other day I accidentally put her blue and pinks in the wrong place and I hate it more than is reasonable.

Photographs from the Education Track & Raspberry Jam

pi yong hee

A rainbow near the Pi'ilani Highway. Haleakala and the Kaupo Gap can be seen in the background

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Great Job with these models of PI Norseman in the early 1960's

This was a lot of work - just the pinning. I was in the floor for 2 hours.

Ombres chinoises sur fond de coucher de soleil.

'Pi'

March 14 - Pi Day

PI

I modified my Raspberry Pi by removing S2 (the so-far unused DSI video connector) and installing a right-angle connector in P5. This gives me easy access to 4 more I/O pins.

Removing S2 didn’t occur without scuffing up the board very slightly. Should anyone want to try it themselves, the trick is to gently pry the plastic of S2 off the pins. It will slide up/off, allowing one to remove the pins individually.

It's hard to see, but I didn’t sit P5 flat against the board. This is for two reasons: 1) The key-tab on some cable ends would have made it impossible to slide on otherwise and 2) That pesky C5 is hiding underneath and I didn’t want to inadvertently scrape it off.