Sandra Boynton’s simply drawn sheep, chickens, cows, ducks, and monsters have entertained children, and their parents, for nearly 50 years, but the hippos have always been at the heart of her work. Thanks to many, many bedtimes, I have warm feelings for those hippos, and now Boynton is revisiting the berserk all-night party in a new book, Hippos Remain Calm. I took the occasion to email with her. We discussed remaining calm in these troubling times, the mysteries of hippopotami, and the connection a parent makes to a beloved story.