There are people called air-ee farmers. And every day they get milk for us to drink.
And it’s a hard job, because milk comes from clouds. So what air-ee farmers do is fly up high in the sky to where the clouds are pure white. That’s where the best milk comes from.
So they fly into the sky, dodging planes, helicopters and the occasional rocket. And when they reach the cloud, they have to tickle it in the right place for the cloud to happily part with it’s milk.
If the air-ee farmer makes the cloud angry then the cloud won’t give them the milk.
And that class, is where milk comes from.