From the intro: > It is crazy if you think about it. People have been using this process despite not knowing what was actually going on for thousands of years! Just wait until you hear about literally everything ever
Or a lot of modern medicine right now. Lots of useful drugs are discovered totally by accident: "Oh look, my patient took this for foot sores and it turns out it helps his hair loss", and then the drug gets used forever more, despite having really no idea at all why it should work. We don't even really know how paracetamol works.