A Beautiful Mind

The Boy: I don't need my coat on in the car. It is warm in the car. It is only cold outside.
Momma: Okay.
The Boy: Why is it warm in the car?
Momma: Because the heat is on.
The Boy: What is the heat?
Momma: The heat is what you turn on inside the car or the house to make it warm.
The Boy: Okay.
Momma: In the summer time when it is hot, we turn on the air conditioner to make it colder inside.
The Boy: Oh, what do we turn on to make it rain?

I told him only God could make it rain. He thought that was a good answer.