I have a four year old daughter. A beautiful, articulate and thoughtful young lady. A preschooler of her age usually has a vocabulary of almost 2,000 words, and though I have not counted them all, I am sure that is about right for her. But of those 2,000-odd words, which one is her favourite? Which one does she seem pull out more than any other? Without a doubt, it is the word ‘why’.