What Would People Know?

[Llloegyr ST]

So, I realize there's often a disconnect between what people know, and what they're characters ought to know.  This ranges from weather patterns to political details and local customs to facts about individual characters (for example… Fame).

I'm going to write a blog post about these sorts of things, but to make it useful… what do you think should be common knowledge that isn't?  Throw out ideas, and I'll pick some of them to work into the blog.