Milk comes from the cow, if you let it sit for 30 minutes or more, cream forms on the top. If you churn or stir it for hours on end it turns to butter, if you add bacteria it turns to yoghurt. Now let it sit around until it goes off, add some salt and you have cheese. Simplified process it may seem, but it does make you wonder how dopey was the bloke that sat around watching cream rise to the top of the milk. Then longer still paddled it for hour to watch it turn to butter and why the hell would you add bugs to mess you already have, taste it and say 'yoghurt, I've just invented yoghurt. But best of all, let it sit around for weeks, months, until it goes off, salt it, eat it and yell 'yippee, I just invented cheese.
And there are olives.
And there are olives.