Happy Pi Day! Fun facts about our favorite irrational number

Pi is an irrational number that expresses the ratio of a circle's circumference to its diameter. You knew that, right? But you might not know that Pi Day was conceived back in 1988 by physicist Larry Shawn of San Francisco's Exploratorium science museum.

Today is 3/14, which means it's time to celebrate Pi Day. How are baseball teams observing the big day?

Today is 3/14, which means it's time to celebrate Pi Day. How are baseball teams observing the big day?

Today is 3/14, which means it's time to celebrate Pi Day. How are baseball teams observing the big day?

Pi is an irrational number that expresses the ratio of a circle's circumference to its diameter. You knew that, right? But you might not know that Pi Day was conceived back in 1988 by physicist Larry Shawn of San Francisco's Exploratorium science museum.