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PROFESSOR: Hello, Ask-A-Scientist, Professor Stephens speaking
CALLER: HELLO! Yes, I want to know how clouds work.
PROFESSOR: Ah, right. Water from the seas or rivers and so on evaporates in the heat from the sun and goes up into the…
CALLER: (INTERRUPTING) Evaporates? Like evaporated milk?
PROFESSOR: Not really, the water goes up into the air where it is cooler so it condenses slightly to form clouds.
CALLER: But how does the water float?
PROFESSOR: It's actually really tiny droplets which…
CALLER: (INTERRUPTING) Because the water in my bath doesn't float.
PROFESSOR: That's a large mass of water, but quite a good analogy, the steam from your bath is like the sea water evaporating and becoming clouds then when it turns into water again on your windows and mirror is like rain which is formed when…
CALLER: (INTERRUPTING) But what about evaporated milk? Is that why clouds are white?
PROFESSOR: No, it's nothing to do with milk. Rain is water in clouds which has…
CALLER: (INTERRUPTING) So how do the cows get up there?
PROFESSOR: What?
CALLER: Do they just send the milk up there to evaporate or is it something to do with all the methane in cows making them float?
PROFESSOR: Methane is actually heavier than air so no.
CALLER: But then they'd also have to float the milkmaids up there to milk them. I suppose they fill the milkmaids with helium or something?
PROFESSOR: Floating milkmaids…?
CALLER: Only I met this milkmaid once and she had a really squeaky voice.
PROFESSOR: (GETTING IRRITATED) No. They don't fill milkmaids with helium, not least because it would almost certainly be a breach of their human rights. In fact, most dairies nowadays use milking machines instead.
CALLER: So what, they put the machines on a plane and fly them up to milk the cloud cows?
PROFESSOR: (EXASPERATED) There's no such thing as cloud cows!
CALLER: But cows lie down in the rain, surely that must have something to do with it?
PROFESSOR: (DEFINITELY IRRITATED NOW) Look! Clouds are made of water. The water goes up into the sky, turns into clouds then comes back down later as rain. There's no milk involved, no cloud cows, no milking machines on aeroplanes and definitely no such thing as helium-filled milkmaids. Understand?
CALLER: (SUBDUED) Yes.
PROFESSOR: Good.
CALLER: So why do they carry milk around in floats then?
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