How about nuclear power?

A man was seated next to a kid in an airplane.

The man turned to him and said,"Let' s Talk."

Kid: Ok, what do we talk about?

Man(Making fun of the kid): How about nuclear power?

Kid: Very interesting topic, But let me ask you a question...?
Horse Cow and Deer, all eat grass.
Yet deer excretes pellets, cow flat potty and horse clumps.

Why? Man: I don't know...!

Kid: Do you really feel yourself qualified enough to discuss nuclear issues when you don't even know shit?