A man sat down next to a young woman on an airplane, and without further ado he began to talk about all the titles he had and his profound knowledge. The young woman only listened, but the man did not stop showing off all his knowledge.
As the young lady kept silent, the man suggested:
-Let's chat.... I've heard that flights seem shorter if you talk to the person next to you.
The young lady who had just opened a book to start reading closed it slowly and said in a soft voice:
-What would you like to talk about?
-Well, I don't know... What about "nuclear physics"? he says, in a mocking tone, and he showed her a big smile...
-Well, that seems to be an interesting topic, but first let me ask you a question... A horse, a cow and a sheep eat the same thing: grass; But, why is the sheep's excrement like small pellets, the cow's is a paste and the horse's looks like a ball of dry grass?
Why do you think that happens?
The man, visibly surprised and now wondering at the young woman's intelligence, thought about it for a moment and said:
-Hmm... I have no idea.
The young lady replied:
-Do you really feel qualified to talk about nuclear physics, when you don't know **it?