There are approximately 1.2 billion people learning a new language, and the majority are doing so in pursuit of a better life. As part of our mission to make education free for everyone, we studied millions of people spanning every country on the planet... until we made a shocking research discovery that led us on a journey around the world, throughout the Middle East and eventually inside one of the world's largest refugee camps in Azraq, Jordan - where even more unexpected discoveries awaited.