Kid 3:  “Mom, we are walking on a solid.”

Me:  “Yes, we are.”

Kid 3:  “Solids are hard,  liquids are in containers, and gases are everywhere.”

Me:  “Sounds pretty right to me.”

Kid 3:  “But what about light?  If light is a gas because it’s everywhere, how does it become a liquid and a solid?  Is a light bulb solid light?”

Me:  “You know you’re six, right?”

Kid 3:  “You know you’re the Mom, right?”