The search for truth in history is always a matter of blazing a path through multiple sources, each with a different perspective. We hope this series about the events that lead to World War I not only taught you new things, but encouraged you to ask new questions. Our writer, James Portnow, sits down to talk about what he learned from researching and writing this series - as well as the mistakes we made along the way. Did the world really hinge on Gavrilo Princip's sandwich? How do we know so much about Russian Foreign Minister Sergei Sazonov's day? We answer these questions and more, but above all, we encourage you to do more research on your own!