While walking by the bathroom this morning, this is what I overheard:
Jayce: "How come the water level in the tub gets higher when someone gets in it?"
Jaina: "That's because of my body pressure. Or water pressure."
Jayce: "Because of how much the water weighs? What does water weigh, anyway?"
Jaina: "Two or three gallons? I think."
Don't worry. We had a little science lesson on displacement this morning :)