I am dumb

On Tuesdays at work, we have a group of old ladies who volunteer, making lunches, packing produce bags, and so on. A few of them call each other "sister." I always assumed that they were some kind of old school 1950s-era feminists or possibly Suffragettes or even Suffragists. Today, after reading a nametag that said "Sr Jude," I realized that they're nuns. It makes much more sense than my earlier assumption, but it's not as fun.