Publisher's Synopsis
Do you remember when you used to keep asking this very important question? What did the grown-ups reply? Were you happy with their explanation? Well, nothing would stop Denis and Hugo until they had received an explanation that would completely satisfy them! This is a story for all the children who have persisted through the dodgy, the worrying, the far-fetched, and even the ridiculous explanations, until they have finally been given an explanation that makes sense.
Age range: 5 to 6
