Mar 9, 2018

Pi Day

Pi Day was invented by physicist Larry Shaw and the first Pi Day celebration was held at the San Francisco Exploratorium in 1988. In 2009 the US Congress officially recognized March 14 as Pi Day in the United States. The 6-trillionth, 8-trillionth, 9-trillionth and 10-trillionth digits of pi, are all fives.