debunkers are us

Here's a crisp debunking of the notion that "Black Friday" originally had anything to do with "going into the black" financially. Instead, it's an old Philadelphia term referring to the hellish day, dreaded by retail workers and cops alike, when crowds swarmed the stores in between Thanksgiving and the Saturday Army-Navy football game.

Excellent. Now that we're done with that one, can we disabuse ourselves of the equally ridiculous notions that "Blue Moon" means "second full moon in a calendar month" or that centuries can only begin in years ending in "01"?