Play Vault's Simon:
"We never truly get anything worthwhile from video-games, do we? We boot up our favourite waste of time, sit back, and let the experience wash over us. Surely this would be a perfect time to start slipping a few educational facts and details, to help us become more knowledgeable of the world while enjoying our game?
Allow me to alleviate the current thought in your mind: No, See, I’m a firm believer that games can be educational, without being an educational game. You can still shoot bad guys, command armies, and solve puzzles, all while learning at the same time. The easiest way to do this is to base the game at a time of history."