National Pi Day is recognized today in the U.S. and around the world. Here's what to know about the quirky holiday, and how to celebrate.

What is Pi Day, and why do we celebrate it every March 14? Here's what to know as math lovers around the world mark Pi Day.

College students, rocket scientists and math enthusiasts around the world are celebrating Pi Day. The holiday is on Thursday, March 14 since 3/14 correlates to the first three digits of the ...

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many ...

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many ...

Math enthusiasts around the world are celebrating Pi Day today, which is March 14 or 3/14.

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many ...

Math enthusiasts around the world are celebrating Pi Day today, which is March 14 or 3/14.

College students, rocket scientists and math enthusiasts around the world are celebrating Pi Day.