A stranger was seated next to a little girl on an airplane when the stranger turned to her and said "Let's talk. I've heard that flights go quicker if you strike up a conversation with your fellow passenger." The little girl, who had just opened her book, closed it slowly and said to the stranger, "what would you like to talk about? Oh, I don't know" said the stranger... "how about nuclear 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 a deer excretes little pellets, while a cow turns out a flat patty, and a horse produces clumps of dried grass. Why do you suppose that is?" The stranger, visibly surprised by the little girl's intelligence, thinks about it and says "hmmm, I have no idea" To which the little girl replies, "Do you really feel qualified to discuss nuclear power when you don't know s***?