An interesting discussion tonight with DS2.25.
DS: Mummy, what's in water?
Me: Hydrogen and oxygen.
DS: No, not oxygen! (He associates this with air.)
Me: Yup, water's two parts hydrogen, one part oxygen.
DS (incredulous): There's oxygen in water?!
Me: I know you're thinking about oxygen in air, like we'd talked about before. It's in water, too.
DS: So there's hydrogen AND oxygen in water. *Giggles away giddily and shakes his head at me*
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What is to give light must endure burning.