## How many digits can you recite?

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## Estimate Pi by Dropping Sticks

A simulator based on one of the oldest problems in geometrical probability approximates pi.

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## Pi Day Mashup

It's Pi Day (and Einstein's birthday). Celebrate with this mix of tributes to the telltale Greek letter that symbolizes that endless number.

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## How Many Digits of Pi Do We Really Need?

Mathematician James Grime of the YouTube channel Numberphile has determined that 39 digits of pi should suffice.

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## Eugenia Cheng: How to Bake Pi

In her new book *How to Bake Pi*, mathematician Eugenia Cheng cooks up digestible math lessons on number theory to topology.

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## SciFri Celebrates π

This year holds an unusually special treat for enthusiasts of the constant π: March 14, 2015 approximates π not just to the usual three digits (3.14) but to five: 3.14.15.