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"Hey Dad, what are clouds made of? Hmm ... I used to know that. I think they're mostly water. So how come they float? Well, it's sort of evaporated water, maybe there are some other gases, too. I'm not sure. So why are they white when the rest of the sky is blue? Heck, beats me. I guess we ought to look this stuff up. I take it there's no qualifying exam to be a Dad."