I really wish YouTube and the internet as we know it today existed when I was in high school. So instead of reading textbooks and taking notes in class, I could just watch YouTube videos and Wikipedia entries on any test I had coming up. Seriously, I could have dozed off in class and just watched this animation detailing the major workings of World War II.
You kids have it so easy now. The animation was made by Manny Man and is a follow up to his WWI explainer.