Superstition superstition, a belief that is held without testing and often without a way to test it, can look like other beliefs. Someone avoids walking under a ladder. Someone knocks on wood. Someone thinks a comet brings bad luck. The difference is not always the content. It is whether the belief is open to being wrong. If no observation could change it, it is superstition. If we could imagine what would count as evidence against it, it is a hypothesis. Superstitions often arise from a coincidence. Two things happened together once. We link them. We tell the story. The story gets repeated. Nobody checks whether the link is real. So the belief persists not because it was tested, but because it was never corrected. That is how harmless customs can become fixed. It is also how dangerous ideas can spread—when people refuse to look at counter-evidence. The cure for superstition is not to believe nothing. It is to believe in a way that can be corrected. We ask: What would have to happen for me to change my mind? If we can answer that, we are not in the grip of superstition. We are in the practice of inquiry. What is one belief you have that you could test? What would count as a fair test?