In episode 3, I posit that your world history should be virtually unknown, and discovery should be a natural part of the game, both for the GM and the players. I (seemingly) made the case that you shouldn't invest in your world history because it's mostly a waste of time.
As you might expect, I think about D&D a lot. In fact, I'm almost always thinking about it. About a year ago, I started thinking about how magic would impact the modern world if it suddenly appeared one day.