Mark your calendars for this week's out-of-the-ordinary holidays.

Thursday, March 14, is National Pi Day, a day to celebrate mathematics and eat pie. Pi is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pie, on the other hand is a delicious baked dish usually made of a pastry dough casing that covers or contains a filling of various sweet or savory ingredients.

Because The Monday Mark was told there would be no math, we'll choose to concentrate on talking about pie instead of pi. Here are some pie facts courtesy of foodreference.com.

  • Pie has been around since ancient Egyptian times. Pies came to America with the first English settlers who baked pies in long, narrow tins called coffyns. The crusts were usually not eaten, but designed to hold the filling during baking.
  • In the 19th century, apple and other fruit pies were a fairly common breakfast item. In fact, fruit pie was considered part of a good, hearty meal before a hard day's work. Ah, the good old days.
  • Nearly twice as many people prefer pie unadorned compared to those who like it topped with ice cream or whipped cream.
  • According to a survey by Crisco and the American Pie Council, America's favorite pie is apple, followed by pumpkin or sweet potato, chocolate, lemon meringue and cherry.
  • According to the American Pie Council, 6 million American men, ages 35 to 54, have eaten the last slice of pie and denied it.

Other holidays this week

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  • Monday, March 11: Worship of Tools Day
  • Tuesday, March 12: Girl Scout Day
  • Wednesday, March 13: Open an Umbrella Indoors Day
  • Thursday, March 14: Potato Chip Day
  • Friday, March 15: Kansas Day
  • Saturday, March 16: Artichoke Hearts Day
  • Sunday, March 17: St. Patrick's Day