Celebrating National Learn About Butterflies Day - A Giveaway!

Although any day is a good day to eat pie (I'll take Dutch apple, please!), March 14th is designated National Pie Day. Actually, it's "Pi" day – the day we honor the ratio of a circle's circumference to its diameter. This unique number in math never ends.

So far, it's been calculated to 22.4 trillion digits with no pattern repeats, and named for the Greek letter π. We usually say pi equals 3.14, so that's why March 14th has been chosen as the day to celebrate this imaginary number. (This might...