SOME FRIENDS AND I went camping last weekend, and as we were setting up the canopy my friend’s forehead brushed some stinging nettles. She immediately started to feel a prickling sensation on her skin, but before 30 seconds had passed she found a fern and rubbed it on her forehead. The stinging stopped. The sickness and the cure were within inches of each other, but not everyone would have known that. Her knowledge gave her agency.