The test will last your entire life, and it will be comprised of the millions of decisions that, when taken together, make your life yours. And everything, everything, will be on it. I know, right? So pay attention. In a mere 15,000 years, humans went from hunting and gathering to creating such improbabilities as the airplane, the internet, and the 99-cent double cheeseburger. It's an extraordinary journey, one that I will now symbolize by embarking upon a journey of my own, over to Camera 2. Hi there, Camera 2, it's me, John Green.