Once again, it’s Pie Day, a day to enjoy a delicious slice of your favorite pie: apple pie, key lime pie, pizza pie, or maybe cherry pie with a damn fine cup of coffee. Whatever’s your favorite, you’ll… Excuse me? You say it’s Pi Day? As in 3.14 etcetera, and not the yummy dessert? In that case, get me a knife and fork and I will demonstrate the concept of the radius.