A new study challenges the idea that learning about others' changes in opinion provides valuable evidence for our own beliefs. The researchers argue that if someone changes their mind, it's only because they have a good reason for doing so, and that the act of changing itself doesn't add any extra value to our understanding. In other words, if you change your mind, it's only because you've thought it through, not because you've gained new insight. The study also suggests that the significance of changing one's mind depends on the context, and that in some situations, it's actually a sign of unreliability.