Every society must understand how the excreta it produces is managed. It teaches us many things about water, about waste, about technologies to clean, economics and politics: of who is subsidised to defecate in our societies. But, most importantly, it teaches us humility. We know so little about our own world. If we knew better, we would understand why we are failing to ensure our present and why we will all need to do things differently, if we want to safeguard our future.