Levi: Why do paper boats not float?
Me: Well--
Ezra: I'll explain it to you!
Me: [sigh of relief]
Ezra: It's because the paper is so light and the water is so heavy and the water just pushes into the boat really hard, like woooosh, and then the boat sinks down.
Levi: Oh.
Me: [That explanation will do just fine for these purposes.]
Ezra: But you could tape some metal to the bottom of it and then it would float really good.
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