As I was getting out of the car with my six year old, he asked a question, "What decides if we have blue eyes or green?"

"Genes!" I say, slamming the door and intending to finish the answer as I open his door.

Jumping out of the car before I can speak he asks incredulously, "So it all depends on what we're wearing?"

This all ended with a conversation on chromosomes and determining gender in utero, so I did actually learn something.