I think that's a good example. Yes or no, is the world "round"? Well, it's sort of a very slightly lumpy oblate spheroid... it also ties into whether we agree

I think that's a good example. Yes or no, is the world "round"? Well, it's sort of a very slightly lumpy oblate spheroid... it also ties into whether we agree on what "round" means. There's a knowledge problem involved - when answering a question you really have to understand the knowledge and intent of the speaker, establish a conversational frame. The first years of university are often spent learning certain "facts" and theories, which are technically incorrect (but useful), which will be torn down and shown as approximations later. Even things that look like "hard" facts are very often a matter of perspective.