little girl on a plane

A stranger was seated next to a little girl on theairplane when the stranger turned to her and said,'Let's talk. I've heard that flights go quicker if youstrike up a conversation with your fellow passenger.' The little girl, who had just opened her book, closedit slowly and said to the stranger, 'What would youlike to talk about?' 'Oh, I don't know,' said the stranger. 'How aboutnuclear power?' and he smiles.OK, ' she said. 'That could be an interesting topic.But let me ask you a question first. A horse, a cow,and a deer all eat the same stuff - grass - . Yet adeer excretes little pellets, while a cow turns out aflat patty, and a horse produces clumps of driedgrass. Why do you suppose that is?' The stranger, visibly surprised by the little girl'sintelligence, thinks about it and says, 'Hmmm, I haveno idea.' To which the little girl replies, 'Do you really feelqualified to discuss nuclear power when you don't know crap?