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*

What is to give light must endure burning.