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:
Produced by Christopher Intagliata, Senior Producer