# An Equation for Every Occasion: Pi Day

Happy Pi Day, readers! In between celebratory pie samplings, get an inside look at the historical context of this famous Greek letter as told by John M. Henshaw, author of An Equation for Every Occasion: 52 Formulas and Why They Matter, coming in paperback this summer.

Click here for pi goodness.

Looking for more historical context from “Equationland”? Use promo code “HDPD” to receive a 30% discount when you order your copy of An Equation for Every Occasion.