March 14, 2015 – or 3/14/15 in month/day/year format – may sound kind of familiar to you math geeks out there. Those are the first five numbers of the mathematical constant pi.
“It’s not defined relative to anything that humans have created, like feet or meters or inches. It’s just a ratio of the circumference of a circle to the diameter of a circle,” says Dr. Bill Graham, math professor at the University of Georgia.
He says even though pi has been around for thousands and thousands of years, there are still mysteries surrounding it.