@grammargirl I was so disappointed to hear an egregious error on your latest podcast that I felt compelled to set the record straight. And so, riffing on an evergreen opening line of a timeless novel, I can only state:

It is a truth universally acknowledged, that the cardboard tube at the centers of rolls of paper products have always been, and will always be, known as a "der-der".

I trust you will set the record straight in light of this fact.

😉