Tough Questions of Life

God what a night.
Tonight, my 3 year old son asked me..."Mommy, why is the sky blue?"
I'm not mentally prepared for these questions...two weeks ago he was asking me what my nipples were...and made the conclusion that he had nipples too.
No one prepared me for questions like these.
Let's not go near the hair issue on mommy and dad's winkie's. He's too young for this.