In today's episode, we look at the etymology of mouse, but really, it's a springboard into a far more complicated topic: the word "mice," its irregular plural form. Why do we say "mice" and not "mouses" when referring to more than one mouse? The answer lies in the grammar of an ancient tongue that predates modern English by thousands of years. This is the most linguistic-heavy episode of Words for Granted yet, so first-time listeners, beware!