The song has probably gotten stuck in your head a whole bunch, but have you given any thought to the meaning behind it? Love it or hate it, “The Twelve Days of Christmas” is a staple tune of, well, Christmas. Singing it over and over again, or perhaps yucking it up to a popular parody, is one of many favorite Christmas traditions. But it’s a bit bizarre! Why is it so long? Why 12 days? Why those...