Let’s start with an exercise. Don’t worry, I don’t want you to stretch your muscles. I want you to stretch your imagination. Imagine a town on the edge of a gorge. Imagine inhabited caves. Each cave is a fully functioning house – there’s a kitchen, dining area, bedroom, bathroom and place for a donkey and some chickens. All in one cave, including a whole family. No running water, only rainwater. No vegetable garden, only tufa limestone. If you want to actually grow something, you have to go to the other side of the gorge. And now imagine 15 000 people living in these caves. Sounds like diseases. Like malaria. And…
