# SciFri Celebrates π

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This year holds an unusually special treat for enthusiasts of the constant π: March 14, 2015, written in abbreviated form, approximates π not just to the usual three digits (3.14), but to five: 3.14.15. Ian Stewart, emeritus professor of mathematics at the University of Warwick and author of *Professor Stewart’s Incredible Numbers*, joins us to celebrate π. “If you’re a mathematical number collector, like a butterfly collector, it would be one of your prized specimens,” he says.

**Other Pi Day Activities:**

**Read an excerpt about pi from Stewart’s book.****Take our Pi Versus Pie quiz****Kitchen Math: How to Eat π Pies****Estimate pi by dropping virtual sticks.**

Ian Stewart

Ian Stewart is author of *Professor Stewart’s Incredible Numbers *(Basic Books, 2015) and *Professor Stewart’s Casebook of Mathematical Mysteries *(Basic Books, 2014) and emeritus professor of mathematics at University of Warwick in Warwick, England.

Christopher Intagliata is Science Friday’s senior producer. He once served as a prop in an optical illusion and speaks passable Ira Flatowese.