If you’re a Catholic, you’ve probably seen it: a mysterious series of letters and numbers, looking for all the world like an equation, inscribed in chalk over a doorway at your parish, or at the home of a friend. Maybe you thought you could figure it out. Maybe you were too embarrassed to ask, “What the heck is that?”
If you don’t know what the chalk is all about, don’t be ashamed. You’re certainly not alone.
Epiphany (also known as Twelfth Night, Theophany, or Three Kings Day) marks the occasion of a time-honored Christian tradition of “chalking the doors.” The formula for

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