Nuclear power

A strange man 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 a 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?''

"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 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 shit?"