It’s Pi Day! The day in March where we stop to admire our favorite irrational number. 𝞹 🥧 Pi can be written as the Greek letter 𝞹 or the number 3.14159... and the number goes on and on and on because 𝞹 is infinite. From sending spacecraft to other planets to driving rovers on Mars, Pi takes us pretty far here at NASA. We asked a few of the researchers, atmospheric scientists, communications strategists and maintenance specialists here at Langley how much of Pi they can recite in celebration of all things Pi!