A stranger was seated next to a little girl on the
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
shit?