I observe that we tend to make an implicit assumption that most statements contain an opinion, perception, and anectotes. It gets harder to think everything in terms of data, e.g. I could ask "What people? Did you perform a study yourself?" for your statement, however, if it aligns with my perception or makes sense even without hard data, I'm not going to do it.

> Studying medieval history at 17 changed my entire way of thinking about credibility

Any books you would recommend?