The REAL difference between boys and girls

On the way to the Johnson's house Noah informed us that he is a boy and his cousin Analia is a girl. Geary asked, "What's the difference between boys and girls?" Noah looked at the back of Geary's head with disbelief, "You're joking me, Dad!" Geary chuckled and then asked again, "No, I'm serious. What do boys have that girls don't?" Noah rolled his eyes and said impatiently, "Boys use chapstick and girls use lipstick."