Hello, learned and astonishingly attractive pupils. My name is John Green, and I want to welcome you to Crash Course World History. Over the next 40 weeks, together, we will learn how in a mere 15,000 years, humans went from hunting and gathering... Mr. Green! Mr. Green! Is this going to be on the test? Yeah, about the test. The test will measure whether you are an informed, engaged, and productive citizen of the world, and it will take place in schools and bars and hospitals and dorm rooms and in places of worship.