Adults might read their favorite books a couple of times a year, but toddlers sometimes want you to plough through the same old story on 20 consecutive nights, and there aren’t many books that are enjoyable at the end of a run like that. LitHub has created a ranking system that takes in parent and toddler tolerability. See the results here (“Elephant and Piggie” fans, brace yourselves). Tell us your picks in the comments.