Oh, Indiana! The mathematical rebel of the United States! This map shows that while the rest of the country celebrates Pi Day on March 14th (3/14, matching the first digits of π = 3.14...), Indiana stands alone in red, celebrating on March 20th. This is a brilliant reference to the infamous "Indiana Pi Bill" of 1897, when the Indiana state legislature nearly passed a bill that would have legally defined π as 3.2 instead of its actual value! A mathematician happened to be visiting and stopped this mathematical crime just in time. Imagine needing a different calculator just to cross state lines! "Sorry officer, I wasn't speeding in Indiana miles!"